Uno is a popular card game that is played with a specially printed deck. The game is designed for 2 to 10 players and involves matching cards by color or number. The objective is to be the first player to get rid of all your cards. Players take turns drawing cards and playing them, while also using special action cards to change the game dynamics. The game starts with each player receiving seven cards, and the remaining cards form a draw pile. When a player has only one card left, they must shout "Uno!" to alert others. If they forget and another player catches them, they must draw two additional cards as a penalty.