Difference between Re-testing and Regression testing

Re-Testing:

When tester finds the bug and report to developers and developer fix that bug now if tester tests only that test case in which he found the bug with same or different data then it is known as retesting.

Re testing requires re-running of the failed test cases.

Re testing is plan based for bug fixes in build notes and docs.

 Regression Testing:

After modification or fixing the bug if tester test that test case in which he found the bug and test all the or specified test cases which he executes earlier then it is known as regression testing . The aim of this testing is that bug fixing is not affect the passed test cases.

It is an important activity, performed on modified software to provide confidence that changes are correct and do not affect the other functionality and components.

Regression testing is generic and may not be always specific to defect fixes.

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