Beginners Guide: What is Software Testing and Why it is Important?

This FAQ post is going to answer the most basic question of "what is software testing" and how it impacts software development at every stage.

What is Software Testing?

Software testing is a process that involves the use of software tools and techniques to detect, prevent, diagnose, and correct software defects. Software testing is an activity performed by individuals or groups to ensure that a piece of software meets its requirements. The term “software testing” does not refer only to unit testing (which refers to individual functions), but also includes all other types of testing such as functional, regression, and performance tests.

So, what is software testing? An inspection involves analyzing, designing, implementing, evaluating, and maintaining systems as well as their applications. There are many types of testing including functional or non-functional testing which focuses on functionality (what does it do?) rather than stability (does it work?). In addition, there are performance-related tests that measure how fast something happens or reacts under certain conditions like load levels, etc. The testing process involves a series of steps that include:

  • Testing procedures for different kinds of bugs found during product development;
  • Implementation of feedback from functional and non-functional tests;
  • Verification of results by executing regression tests on new versions or versions after major changes;
  • Reviewing existing regression tests before writing new ones

>The goal of software testing is to ensure that the software is free of defects and works efficiently.

Software testing is a process that helps in ensuring the quality of software products. The goal of software testing is to ensure that the software is free of defects and works efficiently. It also helps in adding value to the product which makes it useful for its users. To achieve this objective, effective tools are required that help in making sure that bugs are detected early on before they could cause any harm or inconvenience during the deployment or operation phase of a particular application.

>As a profession, software testing encompasses more than just manual testing.

Software testing is a process of ensuring that the software is free of defects, works efficiently, and is bug-free. Software testing includes both manual and automated methods. Manual testing involves manually checking each function in a program to ensure that it performs as expected by an end-user or customer. Automated testing involves writing scripts to perform certain functions automatically on different types of hardware configurations, operating systems, and applications under various conditions (e.g., load conditions).

>The roles of software testers are broad.

Software testing is a broad field that needs effective tools to make the software bug free and add value to the product. This role of software testers is not limited to one specific area or job role, but it can be performed by any employee in any department who knows computers and their applications. There are three types of Software testing:

1. Functional Testing:

Functional testing is a part of software development that checks the software for defects. This type of testing involves running a program, looking at its output, and comparing it with expected results. Functional tests are created by developers and testers to ensure that the systems work properly or are being used as intended. There are several types of functional testing. A few are these:

Smoke Testing

Smoke Testing is the process of verifying that a system is working as expected. It's performed by running tests with a limited set of inputs and outputs and verifying that they produce the right output. A smoke test should be performed on a representative subset of your application: If you're developing an API, you might want to run it against a production-like load (e.g., using our web client), but if you're doing dev work like building out new features or testing existing ones, then it might make more sense to use simulated data instead—for example, by asking users what their email address is before sending them some test emails so that any authentication issues are caught early on in development cycles when they're easier to fix.

Sanity Checking

Sanity checking is a type of testing that checks for errors in the design, implementation, and operation of a system. It's different from functional testing because it focuses on the components themselves—the software itself rather than its output. The idea here is to make sure that your software works as intended before actually running it in production. If you have any problems with this phase of development, they may manifest themselves as bugs later on down the line when customers start using your product—which means they'll need more costly fixes or replacements down the line.

Acceptance Testing

Acceptance testing is the phase of software development that involves testing the software to make sure it meets the customer’s needs. The goal of acceptance testing is to confirm that your product or system works as intended and does what you need it to do. Acceptance testing is not finished until all bugs are fixed, but typically only 50% of them will be found during this process.

Regression Testing

Regression testing is a testing technique to verify that a software product works as expected after a change. Regression testing is performed to ensure that the software product is not affected by changes that were made to the source code. It’s important to know what regression means: it means returning to an earlier state or condition.

If you change something in your program, it's called changing one thing, but if you revert to an earlier version of that same thing (for example, reverting from 3rd party library), then this process would be called regression and would also be considered part of functional testing because we're trying to find bugs in our application by comparing different versions against each other.

Unit Testing

It is the practice of testing each unit of code, such as a function or method. Unit tests are used to verify that each unit of code works as expected and does not contain any bugs.

Unit tests should be written before functional tests so that they can be executed during development; this allows you to identify issues in your code before they become production ready.

Integration Testing

Integration testing is a type of software testing that tests the interactions between software components. Integration testing aims to ensure that all parts work together as expected, and do not produce any errors or omissions when used together.For example, if you want to know whether an application can be used by multiple users at once, you would conduct integration testing on this feature. You could also use it for ensuring that multiple parts of your application are compatible with each other (for instance, one part should not conflict with another).

Interface Testing

It is a type of integration testing. It tests the interface between two components, and it's one of the most common types of functional testing. The test will always be executed against your application in its current state, so you'll need to make sure that your application doesn't change between runs. You can use either manual or automatic controls for this purpose.

2. Non-Function Testing:

Non-functional testing includes a lot of thorough structural and scalability inspections. It is not just a form of security testing or even functional testing, but it is also important to include this in your software development process because it helps identify and resolve issues early on in the development process. Non-functional testing can be used to ensure that your application performs as expected under various conditions, such as different hardware configurations, network topologies, and business processes.

  • Load testing — A type of stress test that simulates heavy loads on a system or component by sending data over it and observing how quickly it responds to that data.
  • Concurrency testing — The process of analyzing how well a system performs when it is being used by multiple users at the same time.
  • Performance testing — An exercise where you measure how well your application handles various workloads and scenarios, including high-volume requests and long-running transactions (such as shopping cart checkout). You can also use performance tests to simulate real-world situations such as denial-of-service attacks or file corruption so you can see whether your code is prepared for such events before they happen in production environments.

3. Maintenance Testing:

Once developed, the software goes with new added features and updates and these tests check the maintenance of the entire suite. One type of such testing is regression testing is the process of testing for regressions. Regression testing is checking that a feature will still work after an update or change. If you have developed your code, then you can expect that it will always have problems and that these problems are most likely to occur in the future if any changes are made in terms of functionality or performance.


Before we conclude the post on the very basic question “what is software testing”, it can be stated that software testing is a process that needs effective tools which help in making the software bug free and add value to the product which makes it useful for its users. Testing helps you to find bugs in your application, before releasing it publicly. The main objective of testing is to ensure that each feature works as expected by users and business stakeholders. Testing also ensures that there aren't any unexpected issues with your software during production deployment or when running on different devices such as mobile phones and tablets etc.

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