Almost every style of poker uses a standard single 52 card deck, although the majority of games remove the jokers from play. The hand ranking for Texas Holdem is as follows:
Royal Flush
The best possible hand in Texas Holdem Ten, Jack, Queen, King, Ace (same suit)
Straight Flush
Five cards of the same suit and in sequential order 9, Ten, Jack, Queen, King, Ace (same suit) Ace, two, three four five (same suit)
Four of a kind
Any four numerically matching cards
Full House
Three of a kind and a pair in the same hand A, A, A, Q, Q ('Aces full of Queens')
Flush
Five cards of the same suit, in any order
Straight
Five cards, of any suit, in sequential order
Three of a kind
Any three numerically matching cards
Two Pair
Two different pairs in the same hand
Pair
Any two numerically matching cards
High Card
The highest ranked card in your hand Ace being the highest and 2 being the lowest