An edger (also known as a lawn edger or stick edger) is a garden tool used to cleanly separate a lawn from a walkway or other paved surface, such as a concrete sidewalk or asphalt path. Edgers may be manual or automated, typically employing a small gasoline (petrol) engine or an electric motor, while newer gas-powered models have four-stroke engines. An edger enables a user to create a clear separation between the lawn and the walkway. It helps to impart a finished appearance that is neater than can be achieved by merely mowing over the border of the lawn and walkway (which frequently permits tufts of low-growing grass to hang over onto the walkway, resulting in an irregular or ragged appearance).