What is a group
A group is a collection of team members that can be managed together. Groups make it easier to give several people the same Hub or product permissions.
Only team members with administrator access or the 'Manage team members and groups' permission can create groups or change their membership.
For example, you could create a 'Managers' group and add each manager to it. In Advanced permissions mode, permissions granted to that group apply to its members. Product access is still allocated separately to each team member from 'Manage team' > 'Product access'.