A Gantt chart typically includes a horizontal axis that represents time, and a vertical axis that represents the tasks that need to be completed. Each task is represented by a horizontal bar that starts at the beginning of the task and extends to the end of the task. The length of the bar represents the duration of the task, and the position of the bar represents the start and end dates of the task.

The chart also includes a series of vertical lines, called "milestones," that represent important events or deadlines that need to be met. Tasks can be grouped into different categories or phases, and each group can be represented by a different color.

Gantt charts are commonly used to plan, schedule and track the progress of complex projects. They help project managers to identify potential problems, such as delays or resource conflicts, and to make adjustments as needed. They also help team members to understand their roles and responsibilities, and to stay on track with their work.