it my based the experiance:
1. To imporve the quality of the product ( product has no bug).
2. For verification & validation.
3. Reliability of system(application)
4.Stability of the system.
5. To found the performance of the system or application.
Based on the company:
Objectives of Testing
Testing is essential because of:
* Software reliability
* Software quality
* System assurance
* Optimum performance and capacity utilization
* Price of non-conformance