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
oriented to prevention?

QA's aim is to avoid bugs in software

Tesing is also called verification, it is one part of QA. 
QA is also called validation. where in the process is 
responsible for the entire software development activity to 
maintain a standard process like CMMI, PSP etc

Quality assurence ensures quality of process used to create 
quality of the product.
1. It deals process
2. It aapplies to entire life cycle
3. It is preventive