Verification is doing the right job.
Validation is doing the job right.
Implies, if there is an application to test, verification 
means, testing the correct application, whereas, validation 
means, testing the application correctly with correct 
testing methods.

1.verification means examing the document and finding a 
error
2.am i building product right
3.it is low level activity
4.methods used in  inspections,walkthrough,per review
validation means excuting the document and finding a defect
2.am i building  right product
3.it is high level activity
4.methods used in black box and white box

verification:verification is building a right producu/right 
application 
validation: validation is building the product/application 
right

Software testing is used in association with verification 
and validation:

* Verification: Have we built the software right (i.e., 
does it match the specification)?.Its process based.
* Validation: Have we built the right software (i.e., is 
this what the customer wants)?.Its product based.

Verification is process oriented. It involves the process 
and procedures followed. Its a preventive action.
Eg: walkthrough, inspection, review checklists...

Validation is product priented. It is ths actual testing of 
the product.