"Innies" refer to a type of belly button that is recessed or inward, creating a small indentation in the abdomen. This shape is common and can be influenced by factors such as genetics, body fat, and the way the umbilical cord was attached during birth. The appearance of an innie can vary from person to person, with some being more pronounced than others. Unlike "outies," which protrude outward, innies are often perceived as more typical. Both types of belly buttons are normal and do not indicate any health issues.