Liquid is a form of dance that many ravers perform. However, there is no right or wrong way to perform it. Considering there are no set rules when doing a liquid dance one may ask how can if be classified.
The terms of classification are sketchy at best, but it can be described as a fluid motion performed with the arms, hands, and body that resembles flowing, seamless liquid.
The art does take many different forms, and names, from place to place, but the basic concept is the same.