Details: This poster says at the top "What I Really Learned in School". It shows poker hands with clever class names.
Poker is a popular type of card game in which players gamble on the superior value of the card combination ("hand") in their possession, by placing a bet into a central pot. The winner is the one who holds the hand with the highest value according to an established hand rankings hierarchy, or otherwise the player who remains "in the hand" after all others have folded. Poker has many variations, all following a similar pattern of play.