A lawn is an area of land planted with grass, and sometimes clover and other plants. Lawns are cut to a low, even height using a lawnmower. Lawns are used for aesthetic (for their beauty) and recreational purposes. Other words used to describe them are turf, pitch, field or green may be used, depending on the sport and the continent.
The earliest mention of lawns comes from France during the 1500s. Lawns (as opposed to fields) found their way to England in the 1700s. One acre of lawn would take three gardeners all day to mow using a tool called a scythe. Today a garden tractor mower with a 48" cut can mow an acre in less than an hour.