Teams
A team is a named group of staff that a ticket can be assigned to, so that a piece of work can belong to several people at once. Administrators manage teams at Administration → Teams.

How a team works
A ticket assigned to a team is assigned to every member. It counts as theirs in Assigned to filters and in For my attention, and they are added as participants.
Teams appear in the Assigned to list alongside people, and can be used in perspectives, quick actions and automations.
System alerts
Every system has a built-in System alerts team, which receives Alert tickets. You choose its members, but it cannot be renamed or deleted, and no other ticket can be assigned to it.