Owner teams can have security roles applied and can therefore own records and have records shared with the team. You create owner teams manually and add users as members of the team.
Teams must belong to a business unit but can have members from other business units. This is the method by which we can breach the strict hierarchy of the business unit/security role model. For instance, an owner team can be created for the Central business unit, but it might contain members from the Operations business unit. A record owned by this team will be accessible by members of the Operations business unit even if their security role provided only the business unit access level to the entity.
Sharing a record requires the user to access a non-intuitive...