A milestone is generally considered to be a key event, typically a deliverable. Milestones often indicate the beginning or ending of major phases or the completion of deliverable(s). Milestones are also excellent reporting points.

You can add a milestone task from the Add option on the Interactive Gantt or by setting the duration of the task as 0d.
When you assign resources to this task, the allocation will automatically be pre-filled by 0%.
A milestone has 0 duration and as such has no additional calculation effect on the schedule.
A milestone can be linked to other tasks.
You can set constraint dates on a milestone.
These tasks are not shown on the Resource Load Chart.

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