Quality Assurance, for cGMP companies (generally pharmaceutical manufacturers) are responsible for compliance issues, usually with the paperwork generated by Quality Control, but also their methods and procedures, in a more general way.
Basically, QA goes over QC documents, making sure they are written in a way that is clear, correct and back traceable, in the event of an audit, either a random audit, or in response to some non-conformance. If you really love paperwork, it's the job for you, if you prefer lab work, QC is more for you.
'Tho I did work one place, where QA was QC, but that was a plating bath company, not a pharmaceutical manufacturer. It sure confuses people when I bring it up at job interviews 'tho.
What else can you tell us about the particular position you're looking for, and your skills, and what you like to do?