Sometimes, schools or styles are introduced by individual teachers or masters, or as a brand name by a specific gym.
Martial arts can be grouped by type or focus, or alternatively by regional origin.
This article focuses on the latter grouping of these unique styles of martial arts.
It is not trivial to distinguish "traditional" from "modern" martial arts.
A large portion of traditional martial arts can be categorized as Folk wrestling (see the separate article), although in some cases a folk wrestling style and a modern combat sport may overlap or become indistinguishable from each other once the sport has been regulated.