Lobbies
Every type of game on the Volity network gets its own lobby, a chatroom dedicated to helping people who like that game find like-minded players and coordinate new games. Each game's detail page in the game finder contains a link to its respective lobby.
Lobbies are just chat rooms, and don't contain any special window controls or other features. They can help you meet other players interested in the games you like, but to actually start or join a game, use the game finder, or allow yourself to be invited into existing tables.