Could you explain confirmation and regression testing?

Could you define a test case?

In your opinion, what will happen to the cost of a software product in a defect that could have been removed during the initial stage of testing is removed/fixed later?

What do you understand by exploratory testing?

Please compare functional and non-functional forms of testing.

Please explain boundary value analysis.

Please explain the relationship between environment reality and test phases.

Can you name the various levels of software testing?

Please define XPath.