>>21664895
Most vodka isnt made from potatoes.
Vodka can be made from literally anything fermentable, including fruits, grains, sugarcane or vegetable matter. What makes it vodka is that it's first column-distilled to near azeotropic concentration (97%) which removes any aromatic esters/oils and congeners so as to make the ethanol as pure and odorless as possible, before being diluted to drinking strength around 40-50%ABV.
In principle, other spirits that are defined by the aromatic qualities imparted by their fermented bases (e.g. whiskey, brandy, rum) can be turned into vodka by stripping away everything that makes them unique.