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Difference between Error, Bug, Defect and Failure

Error: Any mistake in the coding called error. The mistake may be Syntax error, Logical errors or other GUI errors lead errors in any software. These are from developer side.

Defect: The error which made by developer and during testing, Tester is able to find that errors,  means if actual result deviated from expected result then that error called defects. This is caught by testers.

Bug: The defect which is developed by tester team, if expected by the developer team then that defect called an bug.

Failure: If the Software does not meet the client requirement then this is called failure of the software. 

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