What are test case steps used for?

Test steps describe the sequence of specific actions the manual tester should do when he executes a test case run.

For each step the expected result can be defined. Based on the comparison of the expected result and the real result the tester will mark the test step as passed or failed.

If all test steps pass, the test case run is marked as passed, otherwise it is marked as failed and the bug with the description of the issue should be created.