Rye (Secale cereale) is a grass grown extensively as a grain and forage crop. It is closely related to barley and wheat. Rye grain is used for flour, rye bread, rye beer, some whiskies, some vodkas, and animal fodder. It can also be eaten whole, either as boiled rye berries, or by being rolled, similar to rolled oats.
Rye is standardized under the U.S. Standards for Rye.