What is the difference between Verification and Validation testing ?

 Verification : 

1. It involves process like review, walk through and inspection.

2. It involvess difference actives like Requirement review, Design review, Code review and Test case review, Test plan review.

3. We check whether are we  building product right.

Validation : 

1. It involves actual testing.

2. It involves different actives like Functionality, Integration, system, Adhoc, smoke and Regression testing.

3. We check whether are we building right product.