An application is the solution to a problem proposed by the client. In providing the solution, the developer provides an implementation depending upon some rules and algorithms. They concentrate on providing a correct implementation to achieve the appropriate level of quality, which meets the client requirement in all aspects. The developed application must be verified to ensure that it meets the correct requirement and specifications. The process of verifying, to prove that the product is working correctly, is more precisely called; software testing.
Software testing cannot guarantee that the application is high-quality software, but it ensures that the application will operate in a given manner based on the values provided to it. It finds the flaws in the application but doesn't guarantee their absence. We always need to remember that testing of an application is always dependent upon the values which the tester is going to provide. So if a tester fails to judge the condition...