What’s the difference between a Teams site and a channel?
A Teams site is made up of the people (teammates) that you have designated to be a part of your group.
Teams sites are made up of channels, which are the conversations you have with your teammates, along with a collection of Files. Each Teams site has a default channel, General. The Teams site owner may choose to add additional channels.
Additional Microsoft Refs:
- support.office.com/article/learn-about-teams-and-channels…
- support.office.com/en-us/article/video-teams-and-channels…