A Gantt Chart is a type of Bar Chart that shows a project schedule. Gantt charts display the start and finish dates of the tasks, summary elements and milestones of a project. All the elements together comprise the work breakdown structure of a project. The Gantt Chart's vertical axis is a task list. It is possible to enrich the diagram with complex tasks, completion rates, indicators of order and dependency, as well as milestones (markers of key events).