A decathlon is a combined event in track and field athletics that consists of ten different disciplines. Athletes compete over two days, showcasing their skills in running, jumping, and throwing events. The ten events include the 100 meters, long jump, shot put, high jump, 400 meters, 110-meter hurdles, discus throw, pole vault, javelin throw, and 1500 meters. Points are awarded based on performance in each event, and the athlete with the highest total score at the end wins. The decathlon is often seen as a test of overall athletic ability, and it is a key event in the Olympics and other major competitions.