Poker Pay-In is a term used in the game of poker, which refers to the amount of money that each player must put into the pot before the start of the game. The term 'ante' is used to refer to this initial payment, which is usually a small fraction of the minimum bet. This payment is made by all players at the table and is used to create the initial pot, which will be won by the player with the best hand at the end of the game.