Sit & Go

(SnG)
tournaments

A small tournament that starts when enough players register.

Typically 6 or 9 players, single-table format. Endgame strategy is dominated by ICM and push/fold spots.

See also

Double Up
Winning an all-in to double your chip stack.
Freeroll
A tournament with no entry fee but real prizes.
ICM
Converts tournament chip stacks to real-dollar equity.
MTT
A tournament played across many tables, players consolidating until one is left.