The Project Timeline Report is a document used to track the progress of a project throughout its lifecycle. This report typically lists all of the major milestones, tasks and activities that need to be completed in order for the project to be successful. It can also be used to plan for potential risks or obstacles that may arise during the course of the project. Knowing what needs to be done, when it needs to be done, and how long it will take to complete each task is essential for any project manager looking to stay on top of their project timeline. Creating this report allows project managers to better understand the overall scope, duration and budget of any given project.