Final answer:
Bar charts are used in project scheduling to visually represent different tasks or activities and their respective durations.
Step-by-step explanation:
Bar charts are used in project scheduling to visually represent different tasks or activities and their respective durations. Each bar in the chart represents a specific task, with the length of the bar indicating the duration of that task. Bar charts allow project managers to easily identify the sequence of tasks, overlap between tasks, and the critical path of the project.