Testing is an executing a program with a purpose of finding error in a software or system.
IEEE Terminology: A test of the behavior of a program by executing on sample data. Software testing is an activity designed to evaluating the ability of software and determining that it meets its required goal.
The trouble in software testing stems from the complexity of a program. We can not completely test a program. Software testing is more than just finding errors. The purpose of testing can be check the reliability, quality, efficiency, verification and validation.
