Failure: The inability of a system or component to perform its required functions within specified performance requirements. See: bug, crash, exception, and fault.
Bug: A fault in a program which causes the program to perform in an unintended or unanticipated manner. See: anomaly, defect, error, exception, and fault. Bug is terminology of Tester.
Defect:Commonly refers to several troubles with the software products, with its external behavior or with its internal features.
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