It is a process of finding or identifying defects in software is called software testing. It is verifying the functionality(behavior) of the application(software) against requirements specification. It is the execution of the software with the intention of finding defects. It is checking whether the software works according to the requirements.

There are 3 types of software testing:

• White box testing – also called unit testing or structural testing or glass box testing or transparent testing or open-box testing
• Grey box testing
• Black box testing – also called as functional testing or behavioral testing