What is the Latest Activity section on a member's profile?

The Latest button shows the latest activity of that member on your network for the previous 90 days. You can view their opened notes, sent notes, saved drafts, comments/replies, RSVP responses, poll votes, and see which groups they've joined or become an admin for recently. This is essentially the same as The Dashboard, but it is specific to the member whose profile you've opened. 

Like The Dashboard, Super Admins can see all activity, Group Admins can see the activity that's within the groups they are an admin for. Regular members are only able to view their own activity on their own profiles.