Google Groups for Courses provide a place to communicate and collaborate with class members, safely and securely.
Official University Course Groups
Official University course groups can be requested by instructors and teaching assistants. Google Course Groups help students connect, access course information, and communicate effectively over email and on the web. Docs and Google calendars can be shared with students enrolled in a course. Google Sites and really any app available in the google suite can be set up so that only your class has access.
Course Group Membership
Students who add the class will be added to the group automatically. Those who drop will be removed. Group membership is restricted to registered students and instructors. By default, course groups will be disabled at the start of the following semester, and deleted five years later. A course group can be extended beyond the semester end by special request.
For more information, check out the Requesting a Group page.