Horses' paces, also known as GAITS, refer to the different ways in which a horse can move. The four main GAITS are walk, trot, canter, and gallop. The walk is a slow, four-beat gait, while the trot is a two-beat gait that is faster than the walk. The canter is a three-beat gait that is faster than the trot, and the gallop is a four-beat gait that is the fastest of the four. Each gait has its own unique characteristics and can be used for different purposes.