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Vodka is made by the process of distillation of a fermented substance--often potatoes and rye or wheat grain--and less often, sugar beet molasses. Most vodka was traditionally made from potatoes and corn, but in recent years, most high-quality brands of vodka has been distilled from cereal grains.
Vodka and gin are both unrestricted in terms of the base product fermented and then distilled to make the final spirit. As vodka is unflavoured, it can be made with just about anything. If the producer felt so inclined, a grappa (made from grapes) could be called a vodka.