There are 2 roles as follows: User: A user in GTM has read-only access to the containers in the account. They can view all tags, triggers, and variables, as well as see the current state of the container version. However, they cannot make any changes or modifications to the container or its contents. Administrator: An administrator in GTM has full access to all containers within an account. They can add, edit, and remove users, as well as grant or revoke access to containers. Administrators can also create and publish container versions, manage tags, triggers, and variables, and modify container settings.