Some Gantt charts use unchanging solid-colored bars to provide a simple visual for project timelines, while others offer the option to update progress, which changes the color of the bar (or sections of it) to reflect that progress. The chart’s X-axis is the timeline, and the Y-axis contains each task to be completed. On a Gantt chart, each task for the project is listed on the chart and represented by a horizontal bar. They can track a project’s duration in days, weeks, or even months. Make better decisions backed by data and insights Learn MoreĪ Gantt chart is a type of chart that uses bars to visualize project timelines.