What is the difference between last seen and DAU?

Oh no worries at all, I believe I may have asked the question incorrectly. Allow me to clarify:

What DAU/MAU is is clear.
However, the number of members that logged in in the last day used in the DAU/MAU chart seems to be different from the “Last Seen” information I can see from the Admin dashboard.

I just wanted to make sure of this difference for future analysis reference.

Thank you!
Tania