The roster allows you to view all the users in a course or site with just their pictures and names, no other extraneous information. There is also the ability to view the pictures in "learning mode" without names and to print the entire page with images and names.
To access the roster go to the Administration block > reports > roster
The option to view in "learning mode" or to print appear in the top left
This feature can be used as a tool for learning students' names, especially in large classes.