Software testing is one of the important parts in Software development as well as in web development. It is one of the most important phase in Software Development Life Cycle (SDLC). Most of the software projects fail due to lot of bugs or errors in it. So to maintain quality, software testing is important.

All software that we use in our day to day life is tested by professional before it is released in the market. Let’s consider an example. Suppose a company is developing banking software. When the project starts, the company gathers the function requirements of that software. All needs are documented. Then based on this data a rough design of functionality is created. All tasks and modules are shown in this design. These diagrams are also known as data flow diagrams or functional decomposition diagrams. After design phase the actual coding or programming starts when the programmer writes code. After coding the testing phase starts.

There are two main types of software testing. Testing can be carried out manually or it can be automated testing with the help of software testing tools like load runner. In manual testing; the testing professional checks the functionally of that module by entering different sets of inputs. He applies different permutations and combination of inputs so that he can find a potential bug. After entering input if he notifies some error then that error is noted down and the code is again handed over to the programmer.

When the error is fixed by programmer then that module is again tested. Remember that fixing one bug in coding can give rise to other error as the code is altered. If the tester didn’t find any bug then that module is approved. When all modules are completed then the software is tested as a whole. i.e. It is called as integration testing. All modules are combined together and tested to find bugs. If it ok then the software is released in market.

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