Boot heels serve several purposes. First, they provide stability and support to the foot while walking or standing. Additionally, boot heels help protect the feet from external elements such as water, mud, and rocks. Finally, a heel on a boot can also add to the aesthetics of an outfit and make it look more stylish. The type of heel used will depend on the material of the boot, as well as the desired look. For example, a heeled leather boot can be more formal than a heeled rubber one. Boot heels come in different shapes and sizes, so it's important to choose the right style for your needs. Ultimately, the purpose of a boot heel is to provide stability, protection, and a fashionable look.