What does saddle for a horse mean?

When you ride a horse, a saddle is there to provide a stable seat. It helps you keep your balance, helps you get on the horse easier (using the stirrups) and provides something to hold onto, other than the mane. It's also more comfortable than a bony horse's back, too! There are different types of saddles for different disciplines. English, Western, jumping, dressage, racing, all-purpose, etc.