1) Is a 2-sample t-test a non-parametric test? What is the importance of this test?

When should one use a 2-sample t-test? why should it be used?

2) Is an Anderson Darling test a parametric test? what is the importance of this test?

When should one use it? Why should it be used?

3) Is a Mann Whitney test a non-parametric test? what is the importance of this test?

When should one use it? Why should it be used?

4) What is the difference between a 2 sample t-test and a mann-whitney test?