Permissions determine what a person can see and access from their TiM Account for a particular Project.
Permissions allow you to delegate responsibilities to members of your team, so managing a Project can be a group effort.
Multiple people can be granted the same Permission.
Anyone who is not a Company Admin can only grant to someone else on the Project the Permissions they have, and cannot edit their own Permissions.
Permissions are initially set within the Employee Invite, and can be edited at any time from Crew Management via the orange "permissions" link.
Read next: Each Permission in Detail