Scrum is an agile process that focuses on delivering high business value in short iterations. It incorporates QA into the scrum process through:
1) Including testers in sprint planning and estimation. Testing tasks are estimated alongside development tasks.
2) Having testers participate in daily stand-ups to report on testing progress and blockers.
3) Having testers identify lessons learned and best practices from each sprint and drive needs for new test cases.
4) Clearly defining test responsibilities between developers and testers, with developers owning unit testing and testers owning other testing types.