Nilla is a brand name owned by Nabisco that is most closely associated with its line of vanilla flavored, wafer-style cookies. The name is a shortened version of vanilla, the tropical type of flavor common to all Nilla-branded products. Nilla wafers have been flavored with synthetic vanillin since their introduction.Nilla wafers are round, thin, light wafers. "Nilla wafer" may sometimes be used colloquially like a genericized trademark for similar, but unrelated products.