A "Pin-Up Girl" refers to a model whose images are intended for informal display, often in the form of posters or magazine spreads. These images typically feature attractive women in glamorous poses, often emphasizing beauty and fashion. The concept became popular during the 1940s and 1950s, particularly in the context of World War II, when soldiers would keep pictures of these women for inspiration and comfort. The style of pin-up art often includes playful and flirtatious themes, with many illustrations showcasing women in vintage clothing or swimwear. Iconic pin-up girls, such as Marilyn Monroe and Betty Grable, became cultural symbols of femininity and allure. Today, the term continues to evoke nostalgia and is celebrated in various forms of art and media.