Grasslands are just what they sound like, grasslands. There are two types of grasslands that occur on our world; temperate and tropical also called savannas.
Temperate grasslands are the Great Plains of North America and Pampas of Argentina and Uruguay. The predominant plant life is grass. Trees and large shrubs are virtually non-existent. Temperate grasslands make good farmland because the land is flat and soil very fertile.
Tropical grasslands or savannas cover half of the African continent and a good portion of Austrailia and India. Unlike temperate grasslands savannas have distinct wet and dry seasons. This is important because the dry season allows for fires to occur. If not for the dry season and its associated fires areas of savannah would become tropical forests. Individual trees are scattered throughout the savannah.