It is a variant of poker. It is the way to discover some more fun game in poker and learning a little bit more about it. It is also a way to improve your skills. At the beginning of the game, you receive 4 cards hidden; it means that the other players can’t see your cards. In some variants, it is possible to see some of the cards of your opponents.
After receiving your 4 cards, the betting can start. It is not an obligation to raise but playing aggressive and hard can eliminate some players at the beginning. It is important to play with just a few of opponents because more opponents you have more possibilities you have too.
After that, the dealer serves the flop. And a new bet start etc until to get 5 cards on the river. The winner is the player who gets the lowest combination with 2 of his cards and 3 with the river.