In Microsoft Teams, roles and permissions control access to team resources and determine what actions team members can take within the team. There are three leading roles in Microsoft Teams:

1. Owner: Owners manage the team and its resources. They can add or remove members, create, and delete channels, and manage team settings.
2. Member: Members are regular team members who can participate in conversations, share files, and collaborate on projects.
3. Guest: Guests are external users who have been invited to join a team but are not members of the organization. They have limited access to team resources and need help performing specific actions, such as adding or removing members or creating channels.

In addition to these roles, Microsoft Teams also provides a few permissions that can assign to team members. These permissions determine what actions team members can take within specific channels or on particular files. For example, a team member with “Edit” permissions for a channel can add and remove members, while a team member with “Read” can only view the channel’s contents.

You can assign roles and permissions to team members on the “Team settings” page in Microsoft Teams. From there, you can view and manage the roles and permissions of each member, as well as invite new members and manage guest access.