Dimples are small, natural indentations that can appear on the cheeks or chin. They are caused by a variation in the structure of the facial muscles, specifically the zygomaticus major muscle. When this muscle is shorter or has a different attachment point, it can create a dimple when a person smiles. Dimples are often considered a charming feature and can enhance a person's smile. While some people are born with dimples, others may develop them later in life. The presence of dimples is often associated with genetics, as they can run in families. In popular culture, dimples are frequently admired and are sometimes seen as a sign of beauty, as seen in celebrities like Drew Barrymore and Marilyn Monroe.