Defect:
While testing when a tester executes the test cases
he might observe the actual test results do not match with the expected
results. The variation of expected and actual result is known as defect.
- Different organizations have different names to describe this variation, commonly defects also known as bug, problem, incidents, issues.
Error:
If developers misunderstand the requirements then he
should code as per his understand which leads to error.
- Simply programming mistake is called error.
Bug:
If the defect was accepted by the developer it is
called bug.
If major functionality missed after delivering is
called fault.
Failure:
If customer identify the bug in software is called failure.
