Facial characteristics refer to the distinct features of a person's face, including the shape and size of the eyes, nose, mouth, and ears. These features can vary widely among individuals and are influenced by genetics, ethnicity, and age. Common facial shapes include oval, round, square, and heart-shaped, each contributing to a person's overall appearance. Facial characteristics play a significant role in non-verbal communication, as they can express emotions such as happiness, sadness, or anger. Additionally, they are often used in fields like facial recognition technology and cosmetic surgery to enhance or alter a person's appearance based on their unique traits.