What is the primary use of a halter on a horse?

A halter is primarily used for leading and tying a horse. It is designed to fit securely around the horse's head, allowing the person handling the horse to lead it safely and with control. This is crucial in various situations, such as grooming, transporting, or when simply walking the horse.

When a halter is used, it provides a way to communicate with the horse and guide its movements gently. Additionally, halters can be used to tie the horse to a stable or hitching post, ensuring the horse remains securely in place while the handler attends to other tasks.

The other options, while they may touch on certain aspects of horse handling, do not encompass the primary function of a halter. Saddling involves a different type of equipment called a saddle, controlling a horse's head is more associated with bridles, and mounting is done using a saddle, not a halter. Thus, focusing on leading or tying highlights the most significant purpose of a halter in equine management.