- Product Backlog: The product backlog is a list of all the product backlog items, such as user stories, requirements, or features, that need to be delivered for a solution. The items in the product backlog are ranked in order of business value or importance to the customer and are continuously updated throughout a product’s life cycle or a project’s duration. The business analysis effort for any product backlog item focuses on making sure that product backlog items meet the definition of ready. Making a product backlog item ready helps the team refine its business understanding of that item to the point where it has enough information to begin development.

- Release Backlog: The release backlog is a subset of the product backlog that contains the items that the team has committed to delivering in a specific release. The release backlog is created by selecting, in prioritized order, those items that the team is about to commit to deliver in an upcoming release. The release backlog is continuously updated throughout the release cycle.

- Iteration Backlog: The iteration backlog is a subset of the release backlog that contains the items that the team has committed to delivering in a specific iteration. The iteration backlog is created by selecting, in prioritized order, those items that the team is about to commit to deliver in an upcoming iteration. The iteration backlog is continuously updated throughout the iteration cycle.

In summary, the product backlog is a list of all the items that need to be delivered for a solution, the release backlog is a subset of the product backlog that contains the items that the team has committed to delivering in a specific release, and the iteration backlog is a subset of the release backlog that contains the items that the team has committed to delivering in a specific iteration.