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There are three kinds of Channel that can be created in a Team:
- Standard
- These Channels are automatically accessible to all Team Members
- Private
- These Channels are only accessible to specified Members.
- Only Members of the parent Team can be added as Members to a Private Channel.
- Shared
- These Channels are only accessible to specified Members.
- Nearly anyone can be added as a Member of a Shared Channel: A Member of the parent Team, another UNBC account that isn't a Member of the parent Team, even non-UNBC accounts (as long as they are a member of an external M365 tenant that has B2B Direct Connect enabled).
A Team can have up to 1000 Standard and Shared Channels, and up to 30 Private Channels.
Please refer to the Microsoft documentation for a full feature comparison of all three Channel types: https://learn.microsoft.com/en-us/microsoftteams/teams-channels-overview#channel-feature-comparison