The Attendance (Roll Call) tool is an external app (LTI) used for taking attendance in Canvas courses. The Attendance tool can be used for online or face-to-face courses. Enabled at the account level, the Roll Call Attendance tool can be used by all courses in the Canvas account.
The Attendance tool always appears as a visible Course Navigation link, but it cannot be viewed by students, so hiding the link in Course Settings is not necessary. If instructors do not want to use the Attendance tool in their courses, no action is required. However, if you do use the Attendance tool, students can view their attendance report through the Roll Call Attendance submission details page.
Note: The Attendance tool must be enabled for your institution before it can be used in Canvas courses.
From Canvas Basics Guide > What is the Roll Call Attendance Tool?