Verification & Validation

Verification:  It is the process of confirming that s/w "meets
its specification". It involves reviews and meetings to
evaluate documents,plans,code,requirement and
specification.This can be done with checklist,issues lists
and walkthroughs.

Validation:It is the process of confirming that it "meets
the user's requirements". Validation typically involves
actual testing and take place after verification is
completed.