Groups are a feature to help you organise your contacts. A group have contacts or even other groups as members.
What makes groups different from individual contacts is that all events and reminders you add for that group will automatically be shown for each member. For example, if you have add an Event to the group Colleagues, each of the people in that group will show that event on their Contact page.
Adding a group
Adding a group is as easy as pie. You add the name of the new group in the form at the top of the Groups page and click the Add group button.
Add a group member
To add a member to a group, simply add a relation to that contact in the Relations section of the overview.
All relations from a group are considered members. You can recognise this by the word of in the relation. If you want to add a relation from a contact with a group, you need to do that from that contact's individual page.
The image below is taken from the group overview page. The first relation is a member of that group, the second one is not.
On the page of the group member, you will see that the relation is with a group. When both (group) and the word of are visible, then the person is a member of that group. In the image below you see the two options: the first is as a member of the group, the second is not a membership relation.
Groups share a lot of features with contacts. See the Contacts guide to learn more about them.