A "One-Armed Bandit" is a colloquial term for a traditional slot machine, which is a popular gambling device found in casinos. The name comes from the lever on the side of the machine that players pull to spin the reels, resembling an arm. These machines typically feature various symbols, and players aim to line up matching symbols to win prizes. Slot machines operate using a random number generator (RNG) to determine the outcome of each spin. Players insert coins or tokens, select their bet, and pull the lever or press a button to start the game. Modern versions often include digital screens and multiple paylines, enhancing the gaming experience.