Rye (Secale cereale) is a grass grown extensively as a grain, a lid crop and a forage crop. It is a believer of the wheat tribe (Triticeae) and is closely related to barley (genus Hordeum) and wheat (Triticum). Rye grain is used for flour, bread, beer, crisp bread, some whiskeys, some vodkas, and animal fodder. It can with be eaten whole, either as boiled rye berries or by swine rolled, similar to rolled oats.
Rye is a cereal grain and should not be disconcerted with ryegrass, which is used for lawns, pasture, and hay for livestock.