The "400 Metres" is a standard track and field event that involves running a single lap around a standard outdoor track. It is equivalent to approximately one-quarter of a mile and is often considered one of the most challenging sprint races due to its combination of speed and endurance. Athletes competing in the 400 metres must balance their pace to maintain speed throughout the lap. The event is part of major competitions, including the Olympic Games and World Athletics Championships, and is typically run in lanes to ensure fair competition among participants.