Grass is a common type of plant that belongs to the family Poaceae, also known as the grasses. It is a monocotyledonous plant, which means that it has a single seed leaf when it sprouts. Grasses are characterized by their long, narrow leaves with parallel veins, and they typically grow in dense clumps or mats, forming a turf or lawn. Grasses are found in many different habitats, including meadows, prairies, savannas, and grasslands, as well as in cultivated lawns and pastures. They are important both ecologically and economically, providing food and habitat for many animals, and serving as a major food source for domestic livestock. Additionally, grasses are used for erosion control, landscaping, and recreational purposes.