A Gantt Chart is like a « Visual To-Do List on a Calendar. » It uses horizontal bars to show when a task starts and when it ends. The coolest part? It shows how tasks « wait » on each other. For example, it visually shows that you can’t « Paint the Walls » until « Build the Walls » is 100% finished. It’s the easiest way for a manager to see if a project is running on time.