What is a "visor"?

A visor is a type of headgear that consists of a brim or bill at the front and an adjustable band or strap at the back that fits around the head. Unlike a hat, a visor does not cover the top or sides of the head, but only protects the eyes and face from the sun. Visors can be made from a variety of materials, such as cotton, nylon, or plastic, and are commonly used for outdoor activities like golf, tennis, and running. They are also used in professions that require eye protection, such as in construction or laboratory settings. Some visors are designed to be worn with a cap, while others have built-in sweatbands for added comfort.