The jawline is the lower contour of the face, formed by the mandible, or lower jawbone. It plays a significant role in defining facial structure and can influence perceptions of attractiveness. A well-defined jawline is often associated with youth and health. Factors such as genetics, body fat percentage, and muscle tone can affect the appearance of the jawline. Some people may choose cosmetic procedures to enhance their jawline, while others may use exercises or diet to achieve a more defined look. Overall, the jawline is an important aspect of facial aesthetics.