Well nowadays people use them for pleasure (riding), competing in different disciplines - dressage, showjumping etc, farmwork (drafting), racing, rodeos, police work, riding for the disabled etc. In the past they were used for farmwork (ploughing etc), they were the main source of transport and things like that.
Horses played a very vital and important role in the development of where we are now.
In the 'olden days' probably everyone had a horse(s), although the numbers of people with horses have drematically reduced, a lot of people still own and love horses.
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They were good for money because people would sell the horses for money and they were good for trade because they would trade the horses for food, clothing, furs ect.
There are various ways in which horses helped us gain wealth. They used to be key in trading as you would need a horse to get around.