Difference between regression testing and retesting

Regression testing	Re testing
Done whenever there is a change in code	A confirmation technique used once the defect is fixed
To assure that new changes hasn’t caused new issues	To find out whether the issue has been rectified and functionality is restored
Can be done parallel with retesting	Should be performed before regression testing
Passed test cases are used	Failed test cases are put to use
Defect verification is not apart	Defect verification is a part
Can be used to check unexpected results	Confirms that the original fault has been corrected
Automation is the key	Can’t be automated

difference between regression testing and re testing