Software testing is a process in which investigation is conducted to provide the information to the stakeholders about the quality of the product or service which is under test. Software testing provides an objective, independent view of the software so as to allow the business to understand the risks of software implementation.
There is always a big irony with respect to quality. Quality is something which is not assured by the quality assurance team. It is the development team that assures quality. The customer experience is totally dependent upon each line of code written by the developer.