Grass-skirt dances, also known as hulas, are traditional dances originating from the Polynesian islands. They involve swaying of the hips and hands in a circular motion, and are often accompanied by chanting and music. The dancers wear skirts made of grass or other natural materials, which swish and sway with their movements. Hulas are an important part of Hawaiian culture and are used to tell stories, celebrate special occasions, and honor gods and ancestors.