We have discussed two ways of collecting users—organizations and communities. Both of them have their own set of pages and the users who are member of the organization or community can access those pages.

Now, think about a situation where you have a portal for the intranet and we have a few members who like to blog in that portal. So we have a small group of bloggers inside a community. How do we handle this situation? We know that to organize users, we create an organization or a community. However, when it comes to organizing a group which does not fit in the organization or community definition, we can use the user group functionality of Liferay.

User groups are arbitrary collections of users and are created by the portal admin. We create user groups when the users don't have any obvious organization- or community-based attribute which can bring them together. Once the user group is created, we can assign users to the user group. User groups can...