A "cap" is a type of headwear that typically has a rounded top and a visor or brim at the front. Caps are often made from various materials, such as cotton, wool, or synthetic fabrics, and they come in many styles, including baseball caps, snapbacks, and beanies. They are commonly worn for protection against the sun, to keep warm, or as a fashion accessory. Caps can also serve practical purposes in different contexts. For example, in sports, players often wear caps to shield their eyes from sunlight while playing outdoors. Additionally, military personnel may wear specific types of caps as part of their uniforms, symbolizing rank or affiliation with a particular branch of service.