A pin-up model is a type of model whose images are intended for informal display, often in the form of posters or magazine spreads. These images typically feature attractive individuals, often women, posed in a way that emphasizes their physical appeal. The term "pin-up" originated during the 1940s and 1950s, when such images were commonly pinned up on walls, especially by soldiers during World War II. Pin-up models often embody a playful and flirtatious aesthetic, showcasing fashion styles from their respective eras. Iconic pin-up figures include Marilyn Monroe and Betty Grable, who became symbols of beauty and glamour. Today, the pin-up style continues to influence fashion and photography, celebrating vintage aesthetics and body positivity.