The 4x100 meter freestyle relay is a swimming event where four swimmers each swim a distance of 100 meters in the freestyle style. Each swimmer takes turns, with the first swimmer starting in the water and the next swimmer diving in as soon as the previous swimmer touches the wall. The goal is to complete the total distance of 400 meters as quickly as possible. This relay is a key event in competitive swimming, often featured in major competitions like the Olympics and World Championships. Teams are typically composed of the fastest swimmers from a country, and the event showcases both individual speed and teamwork.