Short for hardcore punk that started in the late 70's with bands such as Black Flag and Bad Brains and in the early 80's with Minor Threat, Negative FX, Negative Approach, SSD, JFA, 7 Seconds ect. It is a music genre that is based off of a DIY (do it yourself) community. It was and will always be against the ethics of the mainstream music business to keep the music pure and away from profit which corrupts everything. Alot of people think hardcore died in the 80's but there has been alot of bands that have came and gone over the years that still continued the same diy approach along with musical styles.
currently hardcore punk is still going on in an underground DIY community all around the world with bands such as Get The Most, Rotting Out, Government Warning, Trash Talk, Ceremony, Miles Away, Paint It Black, Psyched To Die, Bracewar, Ruiner, Killing The Dream ect. Although the mainstream community have attempted to market there own version of hardcore bands through the media like Attack Attack, I See Stars, The Devil Wears Prada, Bring Me The Horizon ect. It will never really be part of the real hardcore scene going on, or sound like it.
listen to a current hardcore band like Rotting Out
or a old hardcore band like Gorilla Biscuits