The 400-meter freestyle is a long-distance swimming event in which competitors swim four lengths of a standard Olympic-sized pool. Swimmers use the freestyle stroke, which is characterized by a flutter kick and alternating arm movements, allowing for maximum speed and efficiency. This event is part of major swimming competitions, including the Olympic Games and World Championships. It tests both endurance and speed, as athletes must maintain a strong pace throughout the race. The 400-meter freestyle is often seen as a pivotal event that showcases a swimmer's overall ability and stamina.