Punk is usually faster, louder and simpler that the rock which is usually longer.

* Hardcore Punk, a heavier, faster version of punk rock ** Post-hardcore, a musical offshoot of hardcore punk. ** Hardcore Dancing, a form of mosh dancing or slam dancing ** Melodic Hardcore, a subgenre that's more melodic than traditional hardcore, Straight edge-refers to a lifestyle that started within the hardcore punk subculture

Post-hardcore, melodic hardcore, straight-edge hardcore, emo (emotional hardcore), and screamo are all offshoots of hardcore punk.

A faster, thicker and heavier version of punk rock. Hardcore punk developed in the early 80s, in the wake of the first era of punk. Hardcore punk tended to be more political and more socially aware than the first era of punk; they wrote songs about greedy politicians and starving African children, while the punk rockers from the initial boom of punk wrote about things like doing drugs and falling in love -- classic rock 'n' roll themes.

Grunge, hardcore, pop punk...