A "pin-up" refers to a type of popular culture image, typically featuring attractive models or celebrities, that is designed to be displayed on walls or in magazines. These images often emphasize glamour and beauty, and they became especially popular during the mid-20th century. Pin-up art can include photographs, illustrations, and paintings, showcasing a playful or flirtatious style. The term "pin-up" is often associated with iconic figures like Betty Grable and Marilyn Monroe, who became symbols of this genre. Pin-up images have influenced fashion, advertising, and even military morale, as they were commonly used to decorate barracks and serve as a source of inspiration for soldiers during wartime.