In Microsoft Teams, teams are groups of people brought together for work, projects, or common interests.
Teams are made up of two types of channels — standard (available and visible to everyone) and private. Each channel is built around a topic like "Team Events," a department name, etc. Channels are where users hold meetings, have conversations, and work on files together.
These steps are for users who have accidentally deleted a Teams channel:
Go to the team name and click More options > Manage team. On the Channels tab, find the channel in the Deleted section and click Restore.
All the channel conversations, files, and tabs will be restored.