All‑In means committing all your chips into the pot in a single hand.
Explanation. Going All‑In means you push all your remaining chips into the pot on that hand. It can be done as a bet or a call and is binding once declared verbally or by moving chips. If you’re all‑in and others still have chips, side‑pots may form—those players compete separately. All‑In is often used in tournaments when short‑stacked or with very strong hands; understanding when and how to use it is essential in both cash games and tournament strategy.