A Gantt chart is a visual representation of the planned and expected timeline for a project. It is a tool that helps the project manager to manage their work. Gantt charts have been used since the 1940s and have been around for more than 70 years now. There are two types of Gantt charts, linear and hierarchical Gantt charts. A linear Gantt chart is one that shows tasks in sequential order, while a hierarchical Gantt chart shows tasks in different levels of hierarchy as well as their respective dates. The use of Gantt charts has increased over time with its widespread use in many fields such as construction, manufacturing, engineering and healthcare among many others.