A sit'n'go (often abbreviated as SNG) in poker is a type of tournament that starts as soon as a predetermined number of players register to play. Unlike scheduled tournaments that have set start times, sit'n'gos begin as soon as the required number of players (commonly 2, 3, 6, 9, or 10 players) have entered.
These tournaments have a fixed buy-in and prize structure, typically paying out a portion of the entrants, with larger portions awarded to those finishing higher in the rankings. Sit'n'gos are known for their relatively short duration compared to larger multi-table tournaments, making them popular for players looking for a quicker poker game with a defined start and end time.