straight

A set of five cards in poker that make up consecutive numbers without starting back at the beginning (Aces can count as either 1 above king or 1 below 2)

3,4,5,6,7 is a straight, but Q,K,A,2,3 is not a straight.

two pair

Two different sets of two cards that share the same number or face value.

I have two Jacks and two Aces, so I think I'm good.

pair

A set of two cards that share the same number or face value.

Two 2's is a bad pair, but two Aces is the best starting hand.

three-of-a-kind

Three cards in poker that share the same number or face value.

I got my three-of-a-kind of Aces on the River!