A cameo is a brief appearance or role played by a well-known person, often in a film, television show, or theater production. These appearances are usually unexpected and can serve as a fun surprise for the audience. Famous examples include Stan Lee in various Marvel movies, where he made short, memorable appearances that delighted fans. Cameos can also refer to a type of jewelry or art, typically featuring a carved image or portrait in relief. This form of art often showcases profiles and is made from materials like shell, stone, or glass. Cameos have been popular since ancient times and are still appreciated for their craftsmanship and beauty.