Horse training refers to a variety of practices that teach horses to perform certain behaviors 
horse training must be a rewarding for the trainers to see the horse perform what they want them to do
Horses are trained to be manageable by humans for everyday care 
i guess they are different categories of training
Horses as also trained for  equestrian activities from horse racing to therapeutic horseback riding for people with disabilities.
i think the most common horse training is for racing
Yes for today, but historically, horses were trained for warfare, farm work, sport and transport
a horse is a very versatile animal so that is why you have many different training techniques
movie stunt work to police and crowd control activities, circus entertainment, and equine-assisted psychotherapy.
There is tremendous controversy over various methods of horse training and even some of the words used to describe these methods. Some techniques are considered cruel, other methods are considered gentler and more humane. However, it is beyond the scope of this article to go into the details of various training methodology, so general, basic principles are described below. The "see also" section of this article provides links to more specific
Horse training
Horse training refers to a variety of practices that teach horses to perform certain behaviors when commanded to do so by humans. Horses are trained to be manageable by humans for everyday care as well as for equestrian activities from horse racing to therapeutic horseback riding for people with disabilities.
Historically, horses were trained for warfare, farm work, sport and transport. Today, most horse training is geared toward making horses useful for a variety of recreational and sporting equestrian pursuits. Horses are also trained for specialized jobs from