Gantt Charts are part of every project viewer. You may drag the divider between the table and the Gantt chart horizontally to hide most of it.
The Gantt Chart is a visual representation of your project tasks. They provide a quick-overview of the project, and can be used to show progress, durations, critical paths, milestones, etc.
Use the Gantt Legend from the context sensitive menu for more information.
Use the Timescale, Zoom and Layout functionality which is available in the context sensitive menu to configure the look of the Gantt Chart.