i dont know why you guys jumpin down his throat for asking what a multi is, he may understand technically what it is but not know the technical term for it is, first time i heard it applied to the method it represents was on a rap board, never before or even after that
if you had never been told what swimming was but someone tossed you in the water to force you to learn it, you may not know its called swimming but that doesnt mean you dont understand what the fundementals of it are