What is retesting?

Retesting Testing : re-execution of testcases on same application build with different inputs or test data.

Retesting - Testing functionality after the bug is fixed with different set of inputs

another definition

Retesting:testing the same application to make sure that it does not create any defects and if it does creat defects we r going to fix the bugs and then comes regression testing.in other words retesting is performed to ensure that if at all the bugs were found we r going to perform regression testing.this means that retesting and regression testing are performed in a cyclic process or chain process.

another definition

Re-Testing--
New version of the application under test. Once the new version is ready for release, tests are rerun to ensure the previously found faults are actually been fixed. This is re-testing.

It is rare that a test is used only one time. The reuse of old test is useful- it saves time, shows up changes and it is important for consistent testing.

It is important to write tests so they can be reused. Test should not have to be re-written each time they are run. Re-writing is not only a waste of time, it provides more opportunity for introducing errors into test scripts.

When carrying out re-testing it is useful to also consider additional testing for similar and related faults. 
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