What is retesting and regression testing Defect tracking tool Sdlc,stlc,test case writing , test case design techniques

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Retesting is testing the same functionality again after fixing the defects. Regression testing is testing the entire system after changes.

Retesting ensures that the defects have been fixed and the functionality is working as expected.
Regression testing ensures that the changes made to the system have not affected the existing functionality.
Defect tracking tool is used to track and manage defects found during testing.
SDLC (Software Development Life Cycle) is the process of developing software from planning to deployment.
STLC (Software Testing Life Cycle) is the process of testing software from planning to deployment.
Test case writing involves creating test cases to verify the functionality of the software.
Test case design techniques include boundary value analysis, equivalence partitioning, and decision table testing.

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