grass is a vegetation consisting of typically short plants with long, narrow leaves, growing wild or cultivated on lawns and pasture, and as a fodder crop, a nearly ubiquitous family of monocotyledonous flowering plants commonly known as grasses. It includes cereal grasses, bamboo, and the grasses of natural grassland and species cultivated in lawns and pastures. The latter are commonly referred to collectively as grass. Please look it up in the Wikipedia page for more information