What is the Software Testing?

Software testing is a process to ensure that the Software or Application is Defect-free or Bug-Free. Software testing tester can perform an activity to check the actual result match the expected result. It also helps to identify bugs, errors, gaps or missing requirements in contrary to actual requirements.

1. Functional Testing
2. Non-Functional Testing or Performance Testing
3. Maintenance (Regression and Maintenance)

I hope it's informative...