A lawn sweeper works very much like a home vacuum cleaner, only it requires no electricity. The device has stiff brushes that spin whenever the lawn sweeper rolls. As the brushes whirl, they comb through the grass, catching debris in the bristles and kicking it into a container (hopper) attached to the sweeper. As soon as the hopper is full, you can dump its contents into your compost pile (or trash) and continue your task with an empty hopper.