The answer to 'what is grass' is that grass is a type of green, grassy vegetation that is commonly used as ground cover in lawns, gardens, and other landscaped areas. Grass is a member of the Poaceae family, which includes thousands of different species of plants that have narrow, blade-like leaves and grow in dense clusters or tufts.
Grass is known for its ability to spread and grow quickly, forming a lush, carpeted surface that is soft and comfortable to walk on. It plays an important role in landscaping by providing a natural, attractive ground cover that helps to control erosion, improve drainage, and create a pleasant outdoor environment.