What are some ways people have used horses in their civilizations?
to plow fields
to pull carts - with rich people in
to carry police men
Clydesdales are a draft breed, and as such were bred as work horses capable of pulling large loads and working in the fields. They are usually used now as show horses, circus horses, for crossbreeding to create warmblood and sport type horses... and Clydesdales make up the famous Budweiser horse team. Clydesdales are sometimes, but infrequently used as riding horses. Clydesdale horses are too big for some people to ride.... so people usually use them…
Before modern times, horses were primarily used for two purposes, work and transportation. Horses were used for farm work pulling plows, wagons, and the like while they were also used to transport people and goods from place to place. Today, while some of these activities continue for nastalgia, most horses today are used for pleasure riding or pulling carts. There are pockets of groups, such as the Amish, that still use horses for farm work…
If it weren't for horses then we wouldn't have half the things we have today. When tractors and cars were brought in, people forgot about the value of the horse and everything it did. In some parts of the country, horses are still used in ploughing and farm work, but people mostly have them for pleasure or business.
It matters what time period you're talking about, really. If you're talking about horses in the "olden days" they were used to pull buggies and wagons to carry goods and transport people. Now-a-days they are used in racing and showing. Some people like to ride on trail rides and some just like to gallop for fun!