The Hip Hop movement came about in the 1970s in the South Bronx of New York.  It will always be a street style, but more recently it has found its way into dance studios.  Because of its history, hip hop dance shows off grounded/funky moves set to music with a pulse.  Why take Hip Hop at a dance studio?  Because you have the luxury of perfecting your moves, learning moves from someone who might have something new in front of a mirror on a clean floor with the chance to perform it in front of a bigger audience.