Breakout Rooms in teams are a useful feature in Microsoft Teams meetings, that allow meeting organizers to create sub-meetings within their Teams meeting for smaller groups of participants to collaborate and have discussions.

For information on how to use breakout rooms in teams, see this link, or watch the video below.

If you have trouble using Breakout rooms, Microsoft has published a useful guide for troubleshooting. One important thing to note, is that to create and manage breakout rooms you must be using Microsoft Teams desktop application on a computer (rather than in your browser).

See more troubleshooting information at Breakout rooms troubleshooting guide in Microsoft Teams - Microsoft Support