New Product Software Quality Analysis Question:

Test Case is a document which acts as refrence or record.
Test case includes not only test input and expected behavior
but also test step and description and pass fail criteria.
It is a good practice if we write a test case before we
execute it. It will give a brief idea that what we have to
test. In addition to this it acts as record which can be
used by new tester to understand and then test.