Moodle keeps tracks of user activity in Moodle. To view information from the Moodle logs, click on Gear Icon (top right of page)
Logs - reports on all activity within the course
Live Logs - quick report on course activity in the last hour
Activity report - number of views for each activity in the course. Does not include any user information.
Course Participation - report on if students view or post to a specific activity within the course over the past week.