"While both of these terms are a type of backlog which occurs during a software development project, they have very different meanings. A sprint backlog is an agile term referring to items within a specific sprint that are behind schedule and need a SCRUM Master's attention. The agile development team owns a sprint backlog. A product backlog encompasses the entire development project, including all the sprints, product features, development requirements, and required testing. The project manager owns the product backlog. It is their responsibility to address the items and get the project back on schedule."