Curls refer to the natural or styled shape of hair that forms spirals or loops. They can vary in size, from tight ringlets to loose waves, and are often categorized into different types based on their texture and pattern. Curls are influenced by genetics, hair type, and environmental factors, and they can be enhanced or defined using various hair products. Many people with curly hair use specific techniques and products to maintain their curls, such as curl creams, mousse, and diffusers. Proper care can help reduce frizz and enhance the natural bounce of curls. Additionally, curly hair often requires different styling methods compared to straight hair to achieve the desired look.