Sprint refinement, also known as backlog product refinement or grooming, is a collaborative discussion process that occurs during a sprint to improve the product backlog. It aims to increase team efficiency, reduce uncertainty in estimates, and reduce sprint planning time. The product owner and development team participate to further define and size user stories and prioritize the backlog. Refinement sessions are expected to result in a shared team understanding of user stories, estimated and sized stories, and an optimized product backlog prioritization.