It is easy to execute an operation over all resources in a group, e.g. reboot ten devices at once. Groups also provide an easy way to apply similar settings to all members or automatically replicate configuration changes between them.
With groups, you can have "master" values for group member properties. Changes of master values are automatically applied to all group members.
It's possible to put groups into other groups. Group nesting level is not limited.
Nested groups are often used to reflect complex hierarchies of corporate assets divided by divisions/departments or geographically.
Groups may automatically analyze properties of their members and use flexible rules to evaluate aggregate groups status.
For example, a group of devices may get red ("group members have problems") if at least one device in a group has synchronization errors. If no devices have errors, a group will be yellow ("group members are offline") if at least one member is disconnected and green ("all group members are fine") otherwise.