A cameo is a brief appearance of a well-known person or character in a work of the performing arts, such as a movie, television show, or theater performance. It can also refer to a small piece of sculpture on a stone or shell cut in relief in one layer with another contrasting layer serving as a background, or a small medallion with a profiled head in relief. Cameos are generally not credited because of their brevity, or a perceived mismatch between the celebritys stature and the film or television series in which they are appearing.

In recent years, the term "cameo" has also been used to describe a service offered by the website Cameo, which allows people to hire celebrities to create personalized videos. Thousands of actors, artists, and influencers have set their own rates for a Cameo video appearance, and the service puts fans directly in touch with the artists they appreciate. Cameo videos are personalized for the person receiving it, creating one-of-a-kind connections between celebrities and the people they inspire. Cameo also offers a separate service for businesses looking to promote a product or have a celebrity appear for a virtual event.