Kickboxing is a martial art which was made for beating Muay Thai by Japanese boxing promotor Osamu Noguchi in 1950. Opponents are allowed to hit each other with fists and feet, hitting above the hip. Using elbows or knees is forbidden and the use of the shins is seldom allowed (except in Thai boxing, where the knee is also allowed).

A lot of Americans will tell you that their country is solely responsible for kickboxing. But... While they had a big part in the development of it. It is originally derived from a combination of boxing, an English/European sport/method of fighting, and muay thai or thai boxing, another combat sport, but invented by the Thai people.
Kicboxing blends the kicking techniques (and knees and elbows if you're taught for street fighting too) of Muay Thai, with the more conventional punching and footwork techniques of western boxing.
All in all. It is the most popular "hybrid" as some people would call it, in the world. It is lots of fun, a good way to get some decent fitness, and a good skill to have.

Kickboxing is a Full contact sport in which two guys will kick each other's asses using all of their bodies as opposed to just their hands.

Martial arts commonly used in Kickboxing are: Karate, Muay Thai, Choy Li fut (or Choy lee fut or choy lay fut), or Sanda (or Sanshou).

A grossly misunderstood american martal art when well enough learnt can send any punk ass bitch twice the size and age of you to the ground

presumed by many to be a kicking form of boxing and only to consist of kicking

wrong! kickboxing is a combination of kicking and boxing thus "kickboxing"

kickboxing consists of both punches kicks blocks grabs etc etc etc

busting out wild and deadly sick of it all dance moves in the middle of a hardcore punk rock mosh pit.
Similar to hardcore dancing