Which project management tool is commonly used to outline project timelines?

A Gantt Chart is a widely used project management tool that visually represents the timeline of a project. It allows project managers and their teams to see the duration of tasks, the sequence in which tasks need to be completed, and any overlapping activities. By displaying project milestones and deadlines alongside task dependencies, a Gantt Chart provides an effective way to track progress and ensure that projects remain on schedule.

The use of a Gantt Chart streamlines communication within teams, as it helps everyone involved understand their responsibilities and monitor the overall progress of the project in real-time. This tool is particularly valuable because it transforms complex data into an easily digestible visual format, making it simpler to identify potential scheduling conflicts or delays.

In contrast, while a PERT Chart focuses on task dependencies and the critical path of a project, it does not provide a clear timeline as effectively as a Gantt Chart. Flowcharts and Swimlane Diagrams serve different purposes, primarily for process mapping and visualizing workflows rather than outlining timelines or schedules for projects. Thus, the Gantt Chart's specific function in displaying project timelines makes it the most suitable choice for this question.