A group is a collection of users. Administrators create groups so that the administrator can assign permissions to a number of people at once. For example, it is quicker to give group 'X' access to JIRA, rather than giving every team member access individually. In Crowd, each group belongs to a specific directory. It is possible to have two groups with the same name, such as 'X', in two different directories. A user can be a member of group 'X' in one directory, in both directories or in neither directory. Two groups called 'X' will be presented to an application as a single group with membership lists aggregated. Groups are particularly important in Crowd, as they are used to control access to applications.