Janken is a traditional Japanese hand game often used to make decisions or settle disputes. It is similar to the game of rock-paper-scissors, where players simultaneously form one of three shapes with their hands: a rock (a fist), paper (an open hand), or scissors (a fist with two fingers extended). The rules are simple: rock crushes scissors, scissors cut paper, and paper covers rock. The game is popular among children and adults alike and is frequently played in various social settings. Janken is not only a fun game but also serves as a cultural practice in Japan, often used to determine the order of play in games or to make choices in a lighthearted manner.