Horse culture is a term that refers to the way people in certain places relate to horses. Some people really love horses and use them for lots of things, like riding them or competing in contests on horseback.
For example, in some countries, like the United States, horses are pretty popular and people like to ride them for fun or for work on a farm. They might also have horse shows where people come to watch horses race, jump over things or do fancy dance-like moves.
In other places, like Mongolia or parts of Africa, horses are used more for transportation and for hunting. In Mongolia, people ride horses to find food and move their families around. They also play games on horseback, like trying to pick up a small object while riding fast.
So, horse culture is really just about the different ways that people use and enjoy horses depending on where they live and what they need them for.