The definition of done (DoD) is a set of criteria that a product increment must meet for the team to consider it complete and ready for customers1. It ensures the quality and consistency of a deliverable. The DoD is agreed upon by the entire project team, including developers, testers, product owners, and other stakeholders2. One of the common criteria that is typically included in the DoD for the team increment is regression testing, which is the process of verifying that the existing functionality of the system is not affected by the new changes3. Regression testing is done to ensure that the product increment meets the quality standards and does not introduce any defects or errors4. References: What is the Definition of Done? Understanding DOD in Agile - Atlassian, What is the definition of done? Guide for agile teams with examples - LogRocket Blog, What is Regression Testing? Definition, Tools, Method, and Example, What is typically included in the Definition of Done for the - Madanswer