A lawn mower is a gardening tool used to cut and trim grass on lawns, gardens, or yards. It has a rotating blade or blades that cut the grass to a desired height, providing a neat and well-maintained appearance. Lawn mowers come in various types, including manual, electric, and gas-powered models, catering to different lawn sizes and user preferences. They are essential for lawn care and landscaping, ensuring a tidy and attractive outdoor space.