Software Testing is a process of empirical examination to validate whether the quality of the product or service under test is as per the business requirements and operates as expected. In other words, Software Testing is the process of executing a program or system with the intent of finding errors. It provides a data-based, objective and independent view of the software with respect to the business context in which it is intended to operate.

Most experts across the globe commonly believe that the earlier a defect is found, the cheaper it is to fix it. In order words, defects detected late in the development lifecycle are more expensive to fix.