Recent activity block
The Recent Activity block lists course activity, such as updated resources and activities, forum posts and assignment submissions, since the user last accessed the course.
The activity report filter and generator may be accessed via the Full report of recent activity link.
The setting assignment_showrecentsubmissions in the Assignment settings (accessed via Administration > Modules > Activities) determines whether students can see other students' recent assignment submissions or not. Teachers can always see all recent submissions and students can always see their own recent submissions.