Cavalry refers to a military unit that fights on horseback. Historically, cavalry units were essential for their speed and mobility, allowing them to outmaneuver infantry and engage in quick attacks. They played a significant role in battles before the widespread use of mechanized vehicles. In modern times, the term "cavalry" is often used to describe units that provide rapid support or reinforcements. While traditional horseback cavalry is less common today, the concept remains relevant in military strategy, with units like armored cavalry using vehicles to achieve similar tactical advantages.