What is a Milestone status?
A milestone status generates a task that shows up as a milestone in the project calendar as well as the milestone viewer.
If a project has many statuses to completion, making sure you hit those milestones within the deadlines helps guarantee that your project will be on time.
Enabling statuses as milestones helps you create those projected dates so you can see a project timeline automatically, and at a glance, without having to project your dates manually.
Here’s an example of a video project, with its corresponding milestone dates.
And here’s the calendar visualization.