Lawn cover is a term used to describe the covering of a lawn with either GRASS or SOD. GRASS is a type of vegetation that grows in a variety of climates and is often used as a ground cover for lawns. SOD, on the other hand, is a type of turfgrass that is grown and harvested in large rolls and then laid down over an existing lawn to provide a more uniform and lush look. Both GRASS and SOD are popular choices for lawn cover and can be used to create a beautiful outdoor space.