A mile is a unit of length commonly used in the United States and the United Kingdom. It is equal to 5,280 feet or 1,760 yards. The mile is part of the imperial system of measurement, which is used for various applications, including road distances and athletic events. The term "mile" originates from the Latin word "mille," meaning a thousand. Historically, it was defined as the distance a Roman soldier could march in 1,000 paces. Today, the mile is widely recognized and used in many contexts, including running, driving, and hiking.