A triplet in poker is a combination of three cards of the same rank. A triplet is also known as a “set”. This is a strong hand, as you have three cards of the same rank, which makes it higher-ranking than two pairs or one pair.

For example, if you're holding an ace of hearts (A♥), an ace of spades (A♠), and an ace of clubs (A♣), you have a high-ranking triplet of aces. It’s one of the strongest combinations in poker, especially in Texas hold ‘em and Omaha hold ‘em.

The triplet can be used to win a large part of the pot, especially if there are community cards of the same rank on the table or if you have the chance to improve the hand to a “quad” (four cards of the same rank).