V-tec ?

I know this may sound like a really dumb question, but please take it easy, im new to honda/acuras...What exactly is V-tec, Im always hearing peolpe say their v-tec kicks on hard and some talk about v-tec controllers, etc. Could someone please explain to me what exactly V-tec is. Thank you very much

Originally posted by b16a3sol
http://www.nsxprime.com/FAQ/Technical/VTEC.htm

MODERATOR!!! MODERATOR!!!!! This site should be put on the FAQ page if it isn't already there.