There is no one definition to describe hip-hop dance. 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. Hip-hop dance is a fusion of street dance disciplines and cultural interpretations from around the world. A hip-hop dance routine incorporates the look, music, attitude, posture and street dance style to make it uniquely hip-hop. The most real routines showcase a variety of hip-hop dance styles, signature moves and choreography conveying the character and energy of the street.
In competition dancing, dancers are judged on certain criteria like technique and complexity; music expression and interpretation; variety and creativity; formations and visual image; team performance and presentation. Any moves that risk injury to a crew member as well as any risky and dangerous moves would be deemed unacceptable.
For more in-depth information on Hip Hop dancing check out the HIP HOP UNITE website 
(Our affiliated international federation).

FISAF World Champs 2014 - Vuelta (Adult Hip Hop)