Roles determine what people can see and do in Slack. There are administrative roles that are designed for people responsible for managing accounts and settings in Slack. Non-administrative roles let people work in Slack and access key features.
Full members Members have access to use features in a Slack, except for those that are limited to only owners and admins.
Multi-Channel Guests (Available on paid plans only) Multi-Channel Guests have limited access inside Slack. Admins can add them to more than one channel inside Slack.
Single-Channel Guests (Available on paid plans only) Single-Channel Guests have limited access inside Slack. Admins can add them to one channel inside Slack.
Invited members Invited members have been invited to join Slack, but haven’t yet accepted their invitation. People can add them to channels, mention them, and send them direct messages (DMs) and they'll receive email notifications until they create their account.
Additional roles on the Enterprise Grid plan
On the Enterprise Grid plan, there are additional roles that give organizations the ability to manage Slack:
Org Owners Primary Org Owners can assign Org Owners. Org Owners hold the same level of permissions as the Primary Org Owner, except they can’t transfer ownership of the org to someone else.
Org Admins Org Owners can assign Org Admins. They help manage org-level policies and other administrative tasks.
On the Enterprise Grid plan, system roles give organizations more flexibility around permissions that can be granted to members. Administrators with permission to assign roles can give users one or many system roles to help them manage the organization. For example, give a full member the ability to manage your organization's security features by assigning the Security Admin system role.