Software Testing Vs Quality Assurance

Software Testing is the process of evaluating a system by manual or automated means to verify that the system meets the requirements or whether the expected result is equal to the actual result .It is oriented to 'detection'.
It is 'product oriented'.Testing comes under Quality control and it is focused towards correcting the defects

Software QA involves the entire software development process-monitoring and improving the process, making sure that they agreed-upon standards and procedures are followed, and ensuring that problems are dealt with. It is oriented to 'prevention'.
It is 'process oriented'.It is focused towards preventing the defects.