The 4x100 metres relay is a track and field event where four runners each sprint a distance of 100 metres. Each runner must pass a baton to the next runner within a designated exchange zone. The goal is to complete the race in the shortest time possible, with smooth baton exchanges being crucial for success. Teams are typically composed of four athletes, and the race is often held during major competitions like the Olympics and World Championships. The event showcases speed, teamwork, and precision, making it one of the most exciting races in athletics.