means A cocktail of tequila, lime juice, and an orange liqueur, typically served in a salt-rimmed glass.

from The name is simply Spanish for "daisy" (Margarita), the flower — and "Daisy" was already a recognized class of American cocktails in the late 19th and early 20th centuries, spirits brightened with citrus and liqueur. So the tequila version may be a Spanish-language echo of that Daisy family. Beyond that, the drink's birth is fogged by competing legends: a half-dozen bartenders and socialites all claim to have invented it for some woman named Margarita around the 1930s–40s, but none can be proven, and the honest answer is that no one truly knows who poured the first one.