Why should we perform Software Testing? 

Software Testing is necessary and important due to the below reasons:

• Checking whether Software Developed is as per Client Requirements.
• By checking whether the actual developed functionality of the Software is matching Client specified requirements.

To identify defects

• Everyone makes mistakes and they cannot find these mistakes by themselves.
• By performing Software Testing, we can identify the mistakes made by others during the Requirements, Design and Development phases of SDLC.

Improves the Quality of the Software 

• By identifying defects and getting them fixed by developers, the overall quality of the Software will improve.
• As per User Needs and is ready for real use.
• By checking whether the developed Software is according to the User Needs and Expectations.

Ease of Use

• By checking whether the developed Software is easy to use by end users.

Lot of other factors

• To check other factors like Performance, Security of the Software.