Endevor is a software change management tool used for managing and tracking changes to software systems. It allows multiple developers to make changes to the same codebase without interfering with each other's work, and provides a structured workflow for reviewing and approving changes before they are incorporated into the main codebase. Endevor can also track changes made to different versions of a software system, and allows developers to roll back changes if needed. Overall, Endevor helps to ensure that changes to a software system are properly managed and documented, and that the system remains stable and reliable over time.