Quality Control: Is an art of documenting and reviewing the 
quality. Generally involves verification of the 
documentions.

Quality Assurance: Is the actual validation of the quality. 
This involves actual testing.

it is vice versa of the above answer.

QC is testing quality of the product.
QA is delivering the Quality in the product including the 
documents and process..

QA: QA involves with review and verification of the 
requirements ans other documents, infact it starts with the 
very begining of development.

QC: QC involves with validation of requirement by verifying 
whether the documented reuirements are correct and 
application is behaving as per the specification or not. 
Testing of the application using different input domains 
ans different approch is the best example of QC

QA stablishes and evaluates the process which produce 
products.
QC verify the products produced meets the requirements and 
standards.