Rap is a vocal style, usually coming together with hip-hop, the musical genre off-shoot of the hip hop culture. Rapping itself, also known as emceeing, MCing, spitting, or just rhyming, is the rhythmic spoken delivery of rhymes and wordplay. Rapping is one of the four pillars of the hip hop culture, along with DJing, graffiti, and breaking.
Rap is also considered a separate genre from hip hop in some cases where the artists do not make music compatible with the hip hop culture. Read more on Last.fm.