Reins are long, narrow straps made of leather or synthetic materials that are attached to a horse's bridle. They are used by riders to guide and control the horse's movements. By pulling on the reins, a rider can signal the horse to stop, turn, or speed up, making them an essential tool for effective riding. In addition to their use in horseback riding, reins can also be found in other equestrian activities, such as dressage and show jumping. Proper use of reins helps ensure the safety of both the rider and the horse, allowing for clear communication during various riding disciplines.