A 4‑bet is a re‑raise to a 3‑bet, usually made preflop.
Explanation. In poker, especially No‑Limit Hold’em, a 4‑bet happens when a player raises, another 3‑bets (re‑raises), and then someone re‑raises again—that’s the 4‑bet. It’s generally only seen preflop, used with premium hands like AA or KK to build the pot or apply pressure. Occasionally it’s used as a bluff to force folds. Understanding ranges and position is critical at more advanced levels of strategy.