Basic Questions & Answers on SDLC

BASIC SDLC QUESTIONS AND ANSWERS

01.Q) What is SDLC?

A) In full SDLC is System Development Life Cycle. It is a process used by Software Professionals to create, modify or maintain software systems. It mainly defines the models and methodologies that is commonly used to develop these systems.

02.Q) What are the benefits of using SDLC?

A) Using SDLC properly should result in following benefits for Software systems.

        - A high quality system.

        - Meets or exceeds customer expectations.

        - Timely completion.

        - Complete within estimated budget.

        - Effective and efficient working system.

        - Inexpensive to maintain.

        - Cost-effective to enhance

03.Q) What are the different phases of SDLC?

A) Major phases of SDLC could be defined as 

         - Initiation

         - Feasibility

         - Requirements Collection

         - Design

         - Development

         - Verification

         - Maintenance and Review

04.Q) Explain Initiation and Feasibility phase.

A) The Objective of Initiation and feasibility is to 

         - Perform Initial Analysis

         - Explore alternate solution

         - Define costs and benefits

         - Propose preliminary plan

05.Q) Explain Requirement Collection phase.

A) Generally the following things are done in Requirement collection phase.

         - Problem Definition

         - Analyze current System

         - Focus on decision and related information need

         - Define Business Functionality

         - Define Requirements

         - Plan for training and user acceptance.

06.Q) Explain Design phase.

A) In Design phase the following things are generally being done.

         - Detailed Project Plan

         - Business needs

         - Logical Design

         - Business functions and rules

         - Overall Architecture

         - Process diagrams and other documentations

         - Database design

         - Other system interactions

         - Screen layouts

         - Hardware Procurement's

         - Overall testplans

07.Q) Explain the Development phase.
A) Generally following things are being done under Development phase.
         - More detailed design
         - Actual code development
         - Unit test is prepared and tested.
         - Test case preparation

08.Q) Explain Verification phase.
A) Following things are being done in Verification Stage
         - Verification test
         - Stress test
         - User Acceptance test
         - Security test

09.Q) Explain Maintenance and Review phase.
A) Following steps are being done under Maintenance and Review phase.
         - Process Review
         - Lessons Learned
         - Bug Fixing
         - Scheduled Maintenance
         - Enhancements

10.Q) What are the different Software development methods?
A) These are some of the most common development methodologies:
         - Waterfall
         - Prototyping
         - Spiral
         - Rapid Application Development

11.Q) What is Waterfall model?
A) Waterfall model is a simple and most common process model. It has following characteristics.
         - Sequential process model
         - Process resembles a waterfall
         - Progress of different phases moves downwards.
         - A phase completes before starting next phase.
         - 1st engineering approach of software development.
         - Organized and step by step development

12.Q) What are the different phases of waterfall method?
A) Different phases of waterfall models are 
         - Conception
         - Analysis & Design
         - Construction
         - Testing
         - Production/ Implementation
         - maintenance

13.Q) What is Prototyping model of Software development?
A) Prototype model is a method of developing software or part of a software by developing prototype first. It has following characteristics.
         - Develop Prototype first approach
         - Used to reduce risk
         - Gives early feel of what end product might be.
         - Not a complete development model

14.Q) What are the advantages of prototype model?
A) There are several advantages of Prototype model.
         - Early feel to end users.
         - Reduces risk by prototypes risky modules first
         - End users are most involved
         - Could help understand complications
         - Used to collect feedback
         - Used to collect requirements

15.Q) What are the disadvantages of Prototypes?
A) The disadvantages of prototype model:
         - Developed prototypes could be completely discarded.
         - Not a complete software model
         - No strict plans are involved.
         - Takes away development time.
         - Too much client interaction might reduce focus
         - Risk of scope creep

16.Q) What is spiral model?
A) Spiral model is a mix of Waterfall and prototype model. It attempts to benefit from both. Software development could be visualized as a spiral progression through 4 quadrants.
         - Analysis
         - Evaluation
         - Development
         - Planning
It has the following characteristics.
         - Project is broken down into smaller segments.
         - Smaller segments are easy to change.
         - Easier to evaluate risk and evaluate alternatives.
         - Each cycle progress in same series of steps.

17.Q) What is Rapid Application Development?
A) The basic approach for Rapid Application development is to develop software using iterations. It stresses mainly on delivering production quality software in short iterations.
These are other key characteristics of this methodology:
         - Quick delivery
         - High quality product
         - Reduces Project risk by handling risky modules earlier
         - Each iteration has all the phases (requirement, design, development, testing and release)
         - High user involvement
         - Low cost

Some Basic Unix Question with Answers

SOME BASIC UNIX QUESTIONS WITH ANSWERS

01.Q) What is Unix?

A) Unix is a multitasking, multi-user computer operating system. unix was developed in 1969 by a group of AT & t employees at Bell Labs.

Unix Operating System is very common in 

       - Server

       - Work Stations

       - Mobile Devices 

Unix played a key role in 

       - Development of the Internet

       - Network Computing

02.Q) Give a brief description of Linux.

A) Linux is a Unix like operating system, Originally created by Linus Torvalds. It is an Operating system that is freely distributed under the terms of GNU Public License.

Linux supports following Unix features. Such as:

       - Multiuser Support

       - Multi tasking

       - Networking

       - Support all the standard Unix utilities

       - Can compile major Unix Packages.

03.Q) What is AIX?

A) AIX is an operating system from IBM that is based on a version of UNIX.

04.Q) What is the shell?

A) Shell is the program which acts as a User Interface. It is an Intermediary between Users and Core Unix systems. It is similar to DOS in windows.

05.Q) What are different types of shell?
A) There are many Shells available in different flavors of Unix. But mostly they fall in one of 2 varieties.
Bourne Shell: First appeared in unix version 7.
C Shell: First appeared in BSD.

More common shells available are:
Korn shell: Extension of Bourne Shell
TC shell: Extension of C shell
Bourne Again shell: Extension of Bourne shell, default shell

06.Q) What is the X Window system?
A) The X Window system is the Graphical user interface of Unix. It is originally developed at MIT.
It is based on Client-Server model. the server handles input and output devices and generates the graphical displays used by the clients.

07.Q) How to login and Logout of Unix account?
A) Login: Login requires user name and password. A Unix session could be created directly on server or from a client machine. Once user name and password is validated users are presented with shell prompt to enter command.
Logout: On Command prompt enter "Exit" or "Logout" or exit the client program.

08.Q) What is vi editor?
A) The vi editor is a screen editor which is available on almost all Unix systems. Once you have learned vi, you will find that it is a fast and powerful editor. vi has no menus but instead uses combinations of keystrokes in order to accomplish commands.

09.Q) What is disk quota?
A) A Disk quota is the amount of space allotted to each user for file storage on a given computer.
On shared systems such as Unix, every user has a maximum disk quota. This prevents any individual from using more than his or her fair share of disk space.

10.Q) What is a daemon in Unix?
A) Daemon stands disk and execution monitor. A daemon is a long running background process that answers request for services.
The term originated with Unix, but most operating systems use daemons in some form or another. In Windows daemons are called "services". In unix the names of daemons conventionally end in "d". Some examples include inetd, httpd, nfsd, sshd, named and lpd.

11.Q) What is a group?
A) As the name suggests, Group is a logical collection of users. it is used to manage the access rights of different files and directories to users.
A user can be part of multiple groups and there is no relationships between groups.

12.Q) Give some of the file related commands in Unix?
A) ls: List file
      more: Show file contents
      cat: Show file contents
      mv: Move a file
      cp: Copies file
      rm: removes a file
      diff: compare files
      wc: gives information like line, word and characters
      chmod: changes permission of file
      vi: Editing file
      gzip: File Compression
      lpr: Print

13.Q) Give some of the Directory related commands in Unix?
A) Some of the directory related commands are:
        mkdir: make a new directory
        cd: change (go to directory)
        pwd: present working directory

14.Q) Give some of the search related commands in Unix.
A) Some of the search commands are 
        ff: find files
        grep: looks for strings in files

15.Q) Give some of the connection commands in unix.
A) Common connection commands are:
       nn:: use it to read news
       rlogin: connect to remote host
       telnet: connect to remote host
       ftp: move files to or from remote host
       lynx: browse web

16.Q) Give some of the Self management commands in Unix?
A) Self-management commands
          whoami: returns your user name
          passwd: manage password.
          ps -u: list processes
          kill PID: kills process with give id
          quota: Shows disk quota
          du: disk usage of file or directory
          last: list last login Information

Testing Methods Interview Questions and Answers

SOME INTERVIEW QUESTIONS AND ANSWERS ON TESTING METHODS

Here is one more post I have posted on Testing Methods. Apart from this several more question may be asked by the interviewer. I will keep in my mind to update as much as sample questions possible. And yes friends you can also contribute your questions on the comment box. i will try to reply the simplest possible answer and if it will be a valid question I will post queue it in this post. Also check out my previous post on basic manual testing Interview questions and answers. Click Here.

01.Q) What are different testing methods?
A) Software testing methods are traditionally divided into white and black box testing. Generally there are four types of testing methods are there being used.
             - Black Box testing
             - White Box testing
             - Gray Box testing
             - Visual testing

02.Q) What is Black Box testing?
A) Black Box testing is a method of software that tests the functionality of an application as opposed to its internal structures or workings.
 Specific knowledge of the applications code/internal structure and programming knowledge is not required.
 This method of test can be applied to all levels of software testing: unit, integration, system and acceptance.

03.Q) What is White Box testing?
A) White Box testing is a method of testing software that tests internal structures or working of an application, as opposed to its functionality.
  In White Box testing an internal prospective of the system, as well as programming skills, are used to design test cases.

04.Q) What is Gray Box testing?
A) Gray Box testing is a combination of White Box testing and back Box testing. The aim of this testing is to search for the defects if any due to improper structure or improper usage of applications.
     In Gray Box testing, test engineer is equipped with the knowledge of system and design test cases or test data based on system knowledge.

05.Q) What are the design techniques for Black Box testing?
A) Following are the design techniques for Black Box testing.
           - Equivalence class partitioning
           - Boundary value analysis
           - Decision tables
           - Orthogonal arrays

05.Q) Explain Equivalence Class partitioning?
A) Equivalence class Partitioning: This technique is based on mathematical set theory. When your input domain is too large then you breakdown this domain into finite number of sub domains.
Now when you test your software, every value in these set will be treated as same value. So you can pick one value from each set and test your software. This way you are able to test large set of data with few number of test only.

06.Q) Explain Boundary value Analysis.
A) Input values at the extreme ends of input domain cause more errors in system. More application errors occur at the boundaries of input domain. Boundary value analysis testing technique is used to identify errors at boundaries rather than finding those exist in center of input domain.

07.Q) Explain Decision Tables.
A) Decision tables can be used as a method to identify all possible inputs or combination of inputs and all possible output or combination of output for a test case.
  A Decision table is typically presented as tables with rules as columns and conditions as first set of rows followed by actions or results as second set of rows.

08.Q) Explain Orthogonal arrays?
A) Orthogonal array is a two dimensional array in which if two columns are selected then all the combination of numbers will appear in those columns. In software testing this is applied to eliminate duplicate test cases.

09.Q) What are the different white box test design techniques?
A) White Box test design techniques include:
           - Control Flow testing
           - Data Flow testing
           - Branch testing
           - Path testing

10.Q) What is Control Flow testing?
A) Control Flow testing is a form of White box testing. It is a testing technique which bases its tests on the structure of the code.
   It is generally applicable for comparatively smaller programs or even smaller segments of bigger programs.

11.Q) What is Data Flow testing?
A) Data flow testing looks at the life cycle of a particular piece of data in an application. By looking for patterns of data usage, risky areas of code can be found and more test cases can be applied.

12.Q) What is Branch testing?
A) All branches in the program source code are tested at least once.

13.Q) What is Path testing?
A) All paths in the program source code are tested at least once.

14.Q) What is Negative testing?
A) Testing method in which invalid inputs are entered and the system behavior is evaluated. System should handle the invalid inputs correctly and should not fail.

15.Q) What is Positive testing?
A) Testing method in which valid inputs are entered and the system behavior is tested. System should handle all the valid inputs correctly and perform action as per respective requirement specification.

You can read more question and answers on Basic manual testing here.

Also Check out my other posts on Interview Question and Answers Here.

Manual test Interview Question & Answer

MANUAL TESTING INTERVIEW QUESTION & ANSWERS

                    Hey Friends here are some manual testing Questions and answers for the beginners I have posted in this wall. Meanwhile I am trying to post more articles based on testing. Please get in touch. Please post in the comment box if you have more number of useful questions and answers for beginners. i will definitely try to add those things to this post. Mean while you can also check my other posts where I have updated some interview questions and answers on testing Methods. Check it out.

01.Q) What is Quality Assurance?
A) Quality Assurance(QA) is a process centered approach to ensure that an organization is providing the best possible Software/Product.
02.Q) What is testing?
A) The Process of Detecting and Identifying defects is Testing. A Defect is any variance between Actual and Expected result.
03.Q) Why Testing is required?
A) Testing is required to confirm that a system performs its intended functions correctly and to meet organizational goals like
         - Meeting Requirements
         - Satisfied Customers
         - Zero Defects
         - Improved Market Share
         - To get trust and confidence on the product
         - Ensure less cost of creating and maintaining software.
04.Q) Why does Software have defects?
A) Few reasons for Software defects are
         - Incorrect Requirements
         - Frequently Changing Requirements
         - Complex Business Logic
         - Complex Technology
         - Wrong design
         - Poor Coding
         - Work Pressure
05.Q) How is Testing related to application risk?
A) Proper testing could be used to reduce application risk. An application always has risk of defects in products. Too many defects could result in dissatisfied or frustrated users and this could fail application.
This risk could be minimized by testing application completely and finding out defects before Application goes to Production.
06.Q) What are the principles of Testing?
A) Fit for Purpose: The product should be suitable for intended purpose.
     Right First Time: Mistakes should be eliminated.
07.Q) What is Software Testing Life Cycle?
A) Software testing Life Cycle (STLC) contains following stages.
           - Requirement Analysis
           - Test Strategy Planning and Analysis
           - Test Case Development
           - Environment Setup
           - Test Execution
           - Defect Reporting
           - Summery Report and Analysis
08.Q) What is Requirement Analysis Phase?
A) In Requirement Analysis phase test team studies the requirements from a testing point of view to identify the testable requirements. The QA team may interact with various stake holders(Client, Business Analysts, technical Leads, System Architects etc.) to understand the requirements in details. 
09.Q) What is Test Strategy and Planning?
A) In this stage QA team will determine effort and cost estimates for the project and would prepare the Test Plan.
10. Q) What is Test case development?
A) Test case Development phase involves
            - Identification
            - Creation
            - Verification
            - Rework of Test Cases
 This also includes identification, Creation, Verification and review of Test Data.
11. Q) What is test environment setup?
A) In this phase the Test environment is worked upon. Test Environment decides the software and hardware conditions under which software is tested. It is normally provided by Customer or Development Team. Test environment is where QA team will perform the testing.
12. Q) What is Test Execution?
A) Test Execution Phase: QA Team will execute the Test Cases and scripts. At the end of execution all the defects will be reported to Development team.
13.Q) What is Defect Reporting?
A) The Process of Documenting the failed test case is defect reporting. Defect reporting is a very diligent process which involves:
    - Title
    - Summery of what failed
    - Detailed steps to reproduce failure.
    - Identify Data Elements involved.
    - Screen shots of failure
    - Requirement Specification reference.
    - Failed test case reference.
    - Test Environment
    - Software Product release
    - Software Product Build
    - Defect Severity
    - Defect Priority
Failure to correctly document one or more items might result in rejection or defect.
14.Q) What is Summery Report and Analysis?
A) Summery Report can be generated daily during test execution or end of execution. It might be both. It is used to communicate the progress of test execution to different stake holder of application. (Client, Project Management team, Business Analyst, Development team etc.)

A typical summery report contains following.
         - Percentage of test case execution.
         - Failed test case Number and Percentage
         - Passed test case Number and Percentage
         - Blocked test cases
         - Highlights
         - major Concerns if any
15.Q) Name Few Products for Defect Reporting.
A) Few popular defect reporting tools are 
         - HP Quality Control
         - IBM Rational Clear Quest
         - JIRA
         - Bugzilla
16.Q) What is Functional testing?
A) Functional testing refers to activities that verify a specific action or function of the code. These are usually found in the requirements documentations. Functional test tend to answer the question of "Can the user do this" or "Does this particular feature work"
17.Q) What is Non functional testing?
A) Non Functional testing refers to aspects of the software that may not be related to a specific function or user action.
Few examples of Non Functional testing will be to verify 
        - Scalability
        - Performance
        - Security
        - Throughput
18.Q) What is the difference between verification and validation?
A) Verification is a review without actually executing the Process while Validation is checking the Product with actual execution.
For Example Code review and syntex check is verification while actually running the product and checking the result is validation.
19.Q) What is Latent defect?
A) A Latent defect is an existing defect that has not yet caused a failure because the exact set of conditions were never met.
20.Q) What is Masked defect?
A) A Masked defect is an existing defect that has not yet caused a failure just because another defect has prevented that part of the code from being executed.
21.Q) What is required to begin testing?
A) Following are critical to begin testing
          - Acceptance test plan
          - Requirement Specification
          - Risk area application
          - Testing Data
22.Q) What is Acceptance test plan?
A) Acceptance test plan defines the entire test which the product has to pass so that it can go into production.
23.Q) What is Requirement Specification?
A) Requirement Specification is a complete description of the behaviour of a system to be developed and may include a set of use cases that describes interactions the users will have with the software.
        The requirement specification also contains non functional requirements. Non functional requirements impose constraints on the design or implementation, such as 
              - Performance Engineering Requirements
              - Quality Standards
              - Design Constraints etc.
24.Q) What is Risk Area Application?
A) End user defines the risk area of an application. Application contains multiple functions and certain functions are more critical than other. Risky area are identified early so as to give more importance to it.
Ex- In a Shopping site, Billing pr Product Listing is more critical than product review. The Shopping site can not function without Product Listing or Billing, but it can function to some extent without product reviews.
25.Q) What is Testing Data?
A) Testing Data is Provided by Business Analyst or End Users. It is so important so that the application could be tested as close as possible to the Production condition. 
Testing data is used to develop 
       - Realistic test cases
       - Testing Scenarios
       - Valid and Invalid range
26.Q) What is Regression Testing?
A) Regression testing is the process of testing changes to computer programs to make sure that the older programming still works with the new changes. Regression testing is a normal part of the program development process and, in larger companies, is done by code testing specialists.
27.Q) What is Smoke Testing?
A) Smoke testing is non-exhaustive software testing, ascertaining that the most crucial functions of a program work, but not bothering with finer details. The term comes to software testing from a similarly basic type of hardware testing, in which the device passed the test if it didn't catch fire the first time it was turned on.
28.Q) What is the difference between Severity and Priority in Testing?
A) Severity: Severity determines the defect's effect on the application. Severity is given by Testers

Priority: Determines the defect urgency of repair. Priority is given by Test lead or project manager

1. High Severity and Low Priority : For example an application which generates some banking related reports weekly, monthly, quarterly & yearly by doing some calculations. If there is a fault while calculating yearly report. This is a high severity fault but low priority because this fault can be fixed in the next release as a change request.

2. High Severity and High Priority : In the above example if there is a fault while calculating weekly report. This is a high severity and high priority fault because this fault will block the functionality of the application immediately within a week. It should be fixed urgently.

3. Low Severity and High Priority : If there is a spelling mistake or content issue on the homepage of a website which has daily hits of lakhs. In this case, though this fault is not affecting the website or other functionalities but considering the status and popularity of the website in the competitive market it is a high priority fault.

4. Low Severity and Low Priority : If there is a spelling mistake on the pages which has very less hits throughout the month on any website. This fault can be considered as low severity and low priority.


Here I have also posted some more Interview question and answers on Testing Methods. Check it out Here.

Top Android Interview Questions & Answers

ANDROID INTERVIEW QUESTIONS AND ANSWERS

01.Q) What is Android?

A) It is an open-sourced operating system that is used primarily on mobile devices, such as cell phones and tablets. It is a Linux kernel-based system that’s been equipped with rich components that allows developers to create and run apps that can perform both basic and advanced functions.

02.Q) What are the advantages of Android?

A) The following are the advantages of Android:

* The customer will be benefited from wide range of mobile applications to choose, since the monopoly of wireless carriers like Orange and AT&T will be broken by Google Android.
* Features like weather details, live RSS feeds, opening screen, icon on the opening screen can be customized
* Innovative products like the location-aware services, location of a nearby convenience store etc., are some of the additive facilities in Android. 

03.Q) Mention few disadvantages of Android.

A) Every thing have some disadvantages. Like this following are some disadvantages of Android. 

·         An all-time GPRS connection to run the Android system.

 ·         Being open source it’s always vulnerable. 

 ·         Release of different Android OS for different mobile devices doesn’t allow apps to adapt with all its versions.

 ·         Apps are specific i.e. app running in one version may/may not run on another version.

 ·         Trouble to develop apps to accommodate various screen size and forms.

 ·         Wastage of memory due to a lot of background activities.

 ·         Display of ads in an application though obtained for free

04.Q) Why to use Android?

A) Android is useful because:

• It is simple and powerful SDK
• Licensing, Distribution or Development fee is not required
• Easy to Import third party Java library
• Supporting platforms are – Linux, Mac Os, Windows

05.Q) What Is the Google Android SDK?

A) The Google Android SDK is a toolset that developers need in order to write apps on Android enabled devices. It contains a graphical interface that emulates an Android driven handheld environment, allowing them to test and debug their codes.

06.Q)  What are the key components of Android Architecture?
A) Android Architecture is made up of 4 key components:
- Linux Kernel
- Libraries
- Android Framework
- Android Applications

07.Q) Describe the Android Framework.

A) The Android Framework is an important aspect of the Android Architecture. Here you can find all the classes and methods that developers would need in order to write applications on the Android environment.

08.Q) What are the Types of notification in android?

A) Following are some types of notifications in Android.

                - Tost notification

                - Status bar notification

                - Dialog notification 

09.Q) What is APK Format?

A) The APK file is compressed AndroidManifest.xml file with extension .apk, Which have application code (.dex files), resource files, and other files which is compressed into single .apk file.

10.Q) What is an action?

A) A description of something that an Intent sender desires.

11.Q) What's the difference between class, file and activity in android?

A) Class - The Class file is complied from .java file. Android will use this .class file to produce the executable apk.

File - It is a block of resources, srbitrary information. It can be any file type.
Activity - An activity is the equivalent of a Frame/Window in GUI toolkits. It is not a file or a file type it is just a class that can be extended in Android for loading UI elements on view.

12.Q) What Programming languages does Android support for application development?

A) Android applications supports using Java Programming Language. which is coded in Java and complied using Android SDK.

13.Q) What is a resource?

A) A user defined JSON, XML, bitmap, or other file, injected into the application build process, which can later be loaded from code.

14.Q) How the data will be stored in Android?

A) Internal Storage, Connecting to a network, General Preference, SQLite Database, External Storage.

15.Q)  What is .apk extension?

A) The extension for an Android Package file , which typically contains all of the files related to a single Android Application. The file itself is a compressed collection of an AndroidManifest.xml file, application code (.dex files), resource files, and other files. A Project is compiled into a single .apk file.

16.Q) What is .dex extension?

A) Androi Programs are compiled into .dex (Dalvik Executable) files, which are in turn zipped into a single.apk file on the device.  .dex files can be created automatically translating compiled applications written in the java programming language.

17.Q) What are the different phases of the Activity Life cycle?

A) As an activity transitions from state to state, it is notified of the change by calls to the following protected methods: 

1) void onCreate(Bundle savedInstanceState) 
2) void onStart() 
3) void onRestart() 
4) void onResume() 
5) void onPause() 
6) void onStop() 
7) void onDestroy() 
Taken together, these seven methods define the entire lifecycle of an activity.

18.Q) What is Intent?

A) A class (Intent) describes what a caller desires to do. The caller sends this intent to Android’s intent resolver, which finds the most suitable activity for the intent. E.g. opening a PDF file is an intent, and the Adobe Reader is the suitable activity for this intent.

19.Q) What is an Explicit Intent?

A) In an explicit intent, we actually specify the activity that is required to respond to the intent. In other words, we explicitly designate the target component. This is typically used for application internal messages. 

20.Q) What is an Implicit Intent?

A) In an implicit intent, the main power of the android design, we just declare an intent and leave it to the platform to find an activity that can respond to the intent. Here, we do not declare the target component and hence is typically used for activating components of other applications seamlessly

21.Q) What is AAPT?

A) AAPT is short for Android Asset Packaging Tool. This tool provides developers with the ability to deal with zip-compatible archives, which includes creating, extracting as well as viewing its contents.

22.Q) What does ADT stand for?

A) ADT stands for Android Development Tools The Android SDK includes several tools and utilities to help you create, test, and debug your projects.

23.Q) Differentiate Activities from Services.

A) Activities can be closed, or terminated anytime the user wishes. On the other hand, services are designed to run behind the scenes, and can act independently. Most services run continuously, regardless of whether there are certain or no activities being executed.