What is the deference between regression testing and re-testing?

Answer Posted / sirisha

Regression testing is done on modified build,to test
whether the changes made on the build have effected the
already existing functionality or not,i.e to check whether
the old bugs are modified or not and also any new bugs are
raised or not by the modification of old bugs.

Retesting is done on the same build with multiple sets of
data.

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