Critical paths are available to all users (except collaborators) on Business and Enterprise accounts.
Critical path shows a task or tasks that can cause your project to fall behind (i.e., if a task on the critical path is delayed then you can/will miss your project due date). On the timeline portion of the Gantt chart, all tasks that are part of the critical path turn red, and tasks not on the critical path remain their original color.
You can use critical paths to:
Focus on the tasks that are crucial to the project’s completion.
See what tasks can be rescheduled without affecting the project’s deadlines.
Critical paths highlight:
The latest scheduled task in a folder, project, or space.
If the latest scheduled task is linked to other tasks via dependencies, then any task where even a one-day delay would push out the final task’s end date is also highlighted in red.