The term 'Martini Base' refers to the two main ingredients used to make a Martini cocktail, which are GIN and Vodka. GIN is a spirit made from juniper berries and other botanicals, and is typically distilled in a pot still. Vodka is a clear, colorless spirit made from grains or potatoes, and is usually distilled in a column still. Both GIN and Vodka are essential components of a Martini, and are used in equal parts to create the classic cocktail.