Trimming the lawn is an important part of lawn care. It involves using a lawn mower to cut the grass and then edging the lawn to give it a neat, finished look. Mowing the lawn is the process of cutting the grass with a lawn mower, while edging is the process of trimming the edges of the lawn with a tool such as a string trimmer or edger. Together, these two processes help to keep the lawn looking neat and tidy.