Groups work like email distribution lists, helping you efficiently share documents with your Contacts (colleagues, members of your task force, English 101 students, friends, family, whatever). You can have as many Groups as you'd like.
To create a Group, click on the "Create Group" button under the Groups header (right side of page):
Using Groups lets you:
A list of your Groups — those you've created and those you've been invited to — appears in the right-hand column. Clicking on a group name takes you to a Group page where you can see its members, pending members, and shared documents. Sharing a document with a Group is done from the My Library or Sharing pages (see Sharing).
Only a Group administrator can invite members to join; you invite someone by clicking the "invite" link by the Member header. The administrator can also: