With the Basic setup, 4 different group types will be available:

• public (only, if you allow anonymous users to see community content)
• open (all community members can see these groups and their content)
• closed (all community members can see these groups, but only group members their content)
• secret (only group members can see these groups and their content)

Groups are the heart of the community and the top level to categorize content and users intrests.