Explain Regression Testing Definition, Meaning and Approach?

People are confusing regression testing definition with its meaning and approach although they look like similar but there are few minor changes on regression testing meaning and approaches which are shown below.

Regression Testing Definition with Example

Checking that fixed bug do not affect the other sections of the modules by checking the functionality and other scenarios of testing on different modules and within the similar module in which bug is fixed is known as regression testing.

Note: Do not confuse regression testing with re-testing because in re-testing tester only test whether the fixed bug is getting fixed or not by re-testing it.
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