This document provides an overview of different styles and types of modern dance. It discusses the origins of modern dance in the early 20th century as a new movement that emphasized personal expression in contrast to ballet. Some pioneers who developed unique styles are named, such as Isadora Duncan, Ruth St. Denis, and Martha Graham. The document then summarizes several specific modern dance styles and types, including tango, castle walk, mambo, hip hop, jazz, contemporary dance, and cha cha cha.