Roles: Read Only, Authors, Admins
A Team is the total group of users that are billed together. A Team can be a whole company or a department (ie, sales). Teams can segment access to content by Group within a Team by utilizing Collections. When a company wishes to isolate their knowledge like this, multiple Collections are created to represent each segment of knowledge and the users who have access to it. Across the Team, content in a Collection is accessible to all users in that Collection, with the exception of private Cards that can only be viewed by the individuals explicitly shared on the Card.
How a Group is different from a Team
Groups allow you to divide your Guru Team into sections of users, and those sections of users can then be selected as Card verifiers and @mentioned in comments. Additionally, Roles are determined at the Group level by Collection. Everyone in a Group will have access to all of the content in the Collection.