What is horse driving and what disciplines fall under this category?

Horse driving encompasses a broad range of equestrian activities in which a horse or horses pull a vehicle while guided by a driver holding lines rather than riding on the horse's back. Driving is one of the oldest uses of horses in human history, and in its modern competitive forms it has developed into sophisticated, demanding disciplines that test the horse's training, athleticism, and temperament alongside the driver's horsemanship, precision, and strategic ability. Pleasure driving is the most accessible form of competitive driving, in which horse and vehicle are evaluated on the horse's movement, manners, and overall presentation as a harmonious, pleasant turnout. Pleasure driving classes appear at many breed shows and open shows and serve as the entry point into driving competition for many participants. Combined driving, sometimes called horse driving trials, is the driving equivalent of eventing — a three-phase competition that evaluates the horse and driver through a dressage phase, a marathon phase across country through a course of obstacles, and a cones phase that tests precision and pace. Combined driving is physically and mentally demanding for both horse and driver and is contested at local, national, and international levels. Carriage driving is practiced at shows where historical and stylistic authenticity of the turnout is evaluated alongside the quality of the driving. Breed-specific pleasure driving, roadster classes in which horses are driven at speed, and draft horse hitch classes represent other common forms of competitive driving that attract participants from specific horse breed and interest communities.