Ans:
Step Into: Step Into is used for debugging the test steps line by line.
When the procedure gets called, Step Into enables you to get inside the procedure and debugs the procedure steps line by line.

Step Over: Step Over will enable, only after the debugging is started with Step Into / Run From Step / Run to Step. Step Over is used for debugging the test steps line by line, but when the procedure is called, the entire procedure call will be executed as single step. The cursor never gets inside the procedure.

Step Out: Step Out will enable, only after the debugging cursor gets inside a procedure. The cursor will get inside a procedure only when the test is debugged with Step Into.