A helmet is a protective headgear designed to absorb impact and safeguard the skull during various activities. Commonly used in sports like cycling, football, and skateboarding, helmets help prevent head injuries by providing a cushioning layer. They are often made from materials like polycarbonate or fiberglass, which are lightweight yet strong. In addition to sports, helmets are essential in professions such as construction and firefighting, where head protection is crucial. Specialized helmets, like those used in motorcycling or military applications, may include features like visors or communication systems to enhance safety and functionality.