Layered hair is a popular hairstyle that involves cutting the hair into layers of different lengths. The term 'shag' is often used to describe layered hair, as it is characterized by choppy, uneven layers. This style can be achieved with a variety of cutting techniques, such as razor cutting or point cutting. Layered hair is versatile and can be worn in a variety of ways, from sleek and straight to tousled and wavy.