A pair of mules is a TEAM of two animals, usually horses, that are harnessed together to pull a wagon or other vehicle. They are often used in farming and other agricultural activities, as well as for transportation. The term 'pair of mules' is derived from the Latin word 'mulus, ' which means 'MULE.' Mules are known for their strength and endurance, making them ideal for tasks that require pulling heavy loads.