Difference between Regression Testing and ReTesting

Regression Testing:

1.  Once a bug is fixed, testing in done on the application to make to no other functionality around this bug is broken because of the fix.
2. We need to identify the test cases that we need to be executed once the fix is done.
3. Once a Change Request(CR) is applied on the system, identified regression test cases need to be executed to make sure that because of the new functionality if any other existing functionalities get effected/broken.

Re-Testing:

1. Testing to ensure that the bug is fixed.
2. Once a bug is fixed, make sure that the test case associated with the bug gets executed and Passed.
3. Here testing is not done to check of any other functionality is broken because of the bug fix.