Hip-hop dance refers to street dance styles primarily performed to hip-hop music or that have evolved as part of hip-hop culture. It includes a wide range of styles primarily breaking, locking, and popping which were created in the 1970s and made popular by dance crews in the United States. What distinguishes hip-hop from other forms of dance is that it is often "freestyle" (improvisational) in nature and hip-hop dance crews often engage in freestyle dance competitions. Hip-hop dance can be a form of entertainment or a hobby.