Nail polish is a cosmetic product applied to the nails to enhance their appearance. It comes in various colors and finishes, such as glossy, matte, or glittery. The main ingredients typically include a film-forming agent, solvents, and pigments. Nail polish is used for both aesthetic purposes and to protect the nails from damage. To apply nail polish, the nails are usually cleaned and shaped first. A base coat is often used to protect the nail and improve adhesion, followed by one or more layers of colored polish. Finally, a top coat can be applied to add shine and durability. Popular brands of nail polish include OPI, Essie, and Sally Hansen.