On a Gantt chart, milestones are displayed as diamonds (or, sometimes, a different shape) at the end of a particular taskbar.
Unlike the minor details, which also have to be done, completing a milestone offers a sense of satisfaction and forward motion. Milestones are those tasks that are instrumental to a project's completion and success. This helps ensure that every sub-task is done on schedule so the entire project will be completed on time. Once the sub-tasks have been listed, bars are used to show the time frame in which each task should be completed. A Gantt chart helps project managers keep track of all of the sub-tasks in a project, so nothing is forgotten or delayed. Large projects always consist of a large number of sub-tasks. These are displayed along the top of the chart. One of the main components of a Gantt chart, the dates allow project managers to see not only when the entire project will begin and end, but also when each task will take place.