To flop a set is hitting three-of-a-kind on the flop using a pocket pair.
Explanation. When you hold a pocket pair (e.g. 7‑7) and the flop brings the third of that rank (7‑7‑X), you flop a set. Some of the most profitable situations in poker. Sets are strong hidden hands that dominate many two-pair or overpair scenarios. Understanding flop‑set play is key for value extraction and implied odds theory.