Muay Thai teaches you how to fight. Brazillian Jui-Jitsu and those that are the like teach you how to fight. Any art that you get to actually fight or compete with teaches you how to fight. But guess what? They are considered martial arts. They also teach you to defend yourself against someone that is fighting you.
The practice of fighting or Martial Arts, develops your instinct, adaptability, reactions and increases your luck.
We are all born with certain traits of each of those (except maybe luck), but training increases this.
Nick Simpson wrote:
Martial arts cant teach you to fight. Fighting teaches you to fight. Self defence cant be taught, defending yourself is about doing anything in the moment that will save you, Its about instinct, adaptibility, reactions and luck.