A grass trimmer is a gardening tool designed to cut grass and weeds in areas that are difficult to reach with a lawn mower. It typically features a long shaft with a rotating cutting head at the end, which can be equipped with either a string line or a metal blade. Grass trimmers are useful for maintaining edges along sidewalks, flower beds, and fences. These tools come in various types, including electric, battery-powered, and gas-powered models. Electric trimmers are quieter and require less maintenance, while gas-powered versions offer more power for tougher jobs. Overall, grass trimmers are essential for achieving a neat and tidy lawn.