A Gantt chart is
|“||a diagrammatic representation of the timing and duration of the various sequential phases of a project. It is commonly used in project management and routinely available in many project management software packages.||”|
|“||a horizontal bar chart that graphically displays time relationships. In effect, it is a "scale" model of time because the bars are different lengths depending upon the amount of time they represent.||”|
It is named after Henry Laurence Gantt, the American engineer and social scientist who first developed it. Gantt charts have been around since the early 1900s and are frequently used in business to plan and manage large projects.