Hair characteristics refer to the various traits that define an individual's hair, including texture, color, and thickness. Texture can be straight, wavy, or curly, influenced by the shape of the hair follicle. Hair color is determined by the presence of pigments, primarily melanin, which can range from black and brown to blonde and red. Thickness, or hair density, varies from person to person and can affect how full or thin hair appears. Other factors, such as age, ethnicity, and health, can also influence these characteristics. Understanding hair traits can help in choosing appropriate hair care products and styles.