Quality Assurance: It is a group of management, where they 
monitor and improve the entire development process, monitor 
whether they are able to meet the agreed standards of the 
company and whether problem issues were found and dealt.

Quality control: It is the actual testing for each and 
every phase of an application to meet customer requirements 
or to maintain the quality in an application.

QA : Measuring and monitoring the software development     
process is called Quality Assurance.

QC: The validation of deliverables i.e., outcomes after 
process is called Quality Control.

QA

* QA make sure you are doing the right things  in right way.
* QA is Developing,orgnising the best quality processes.
* QA is the process Related 
* QA is the Preventive Process.

QC

* QC  makes sure the results of what you have done and what 
you expected.
* QC means implementing the process developed by former 
team.
* QC is the actual testing of the software.
* QC is corrective process.

Quality Assurance:
Software QA involves the entire software development PROCESS
- monitoring and improving the process, making sure that any
agreed-upon standards and procedures are followed, and
ensuring that problems are found and dealt with. It is to
'prevention

Quality Control:
A set of activities designed to evaluate a developed work
product.Quality Control makes sure the results of what
you've done are what you expected.

QA - This involves entire testing activities in line with 
software development..

QC - This is the process. Using some metrics(depends on the 
company policy), the software is evaluated with metric 
norms.

QA measures the quality of the process.
QC measures the quality of the product.

Thanks, Suresh