A relay in track and field is a race where teams of athletes pass a baton to one another over a specific distance. Each runner completes their segment of the race, demonstrating speed and coordination during the baton exchange. Relays emphasize teamwork and precise timing, as mistakes in hand-offs can lead to disqualification or lost time. Common relay events include the 4x100 meters and 4x400 meters, featuring varying team strategies and dynamics.