A project plan timeline is a visual representation of the tasks, activities, and milestones involved in a project, displayed in a chronological order. It helps to track progress, identify dependencies, and estimate the completion date of a project. Typically, a project plan timeline includes a list of tasks and their respective start and end dates, with milestones marked along the way. A well-designed project plan timeline template can be a valuable tool to ensure that a project stays on track and on schedule. With the help of a template, creating a project plan timeline can be a quick and efficient process.