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If a tester tests the application find mismatch or any mistake in an application during software testing then it is called Bug.

Bug always will be found by testers, client, or end-users.

The bug will be locked and proceed to test lead, they will analyze and send to the development team.

if the development team approved this then it is called a defect.


If the Actual result of an application is not matched from the expected result then it is called defect .defect can be found by the developer itself, and it can be an approved bug.


The error means if any problem occurs by program code during compilation and execution then it is called Error.


If an application will be crashed completely or particular form data will not be posted to the server then it is called application failure.

Defect Life Cycle or Bug Life Cycle:-

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