A decathlon is a combined event in athletics that consists of ten different track and field disciplines. It is typically held over two days and includes events such as the 100 meters, long jump, shot put, high jump, and 400 meters, among others. Athletes compete to earn points based on their performance in each event, with the overall winner being the one with the highest total score. The decathlon is primarily contested by male athletes, while a similar event called the heptathlon is designed for female athletes, featuring seven events. Both competitions test a range of skills, including speed, strength, and endurance, making them challenging and exciting for participants and spectators alike.