Texas holdem is taking over world, but believe it or not there are many other poker games you can play. Most of them fall into one of three categories: - Stud Games (for example 7 card stud) - Draw Games (for example 5 card draw) - Shared Hand Games (for example Texas Holdem)
There are also some other obscure games that don't fit into these categories, some of more popular of which are high/low pig, bid poker and guts. In almost all types of poker game hand rankings are same, with a very few minor exceptions which have become more or less “home-made” rules.
Here are brief descriptions of some different poker games:
5 Card Draw Poker Played by 3 - 7 players. Each is dealt five cards and there is a round of betting based on hands. After betting players can now put up to three cards back in exchange for new ones. (There's one exception where a player can exchange four cards if he shows fifth to be an ace). There's a further round of betting and best hand wins. Draw poker was once standard way to play but it has of course been overtaken by Texas Holdem.
7 Card Stud Poker Played by 3 - 10 players. Players are dealt two cards face down and one face up and there is a round of betting. Cards 4, 5 and six are then dealt face up with betting on each round. The final card is dealt face down and there is another round of betting before showdown. 7 Card Stud Poker is still a popular game and is probably second at moment to Texas Holdem.
Caribbean Poker This is a poker game played in a casino between player and dealer. Each gets five cards and player has to decide whether his card is worth betting on after seeing dealer's first card. If player has a better hand than dealer he is paid out in a fixed odds system depending on strength of his hand. The fixed odds range from evens for a pair or high card to 100-1 for a royal flush.