Lawn mowers are very important for the maintenance of lawn & garden. This machines helps to keep the lawn grass in shape. Lawn mowers are used on even surfaces unlike brush cutters which can be used of any type of surface.However Lawn mowers ensure a more uniform grass cutting compared to brush cutters. Lawn mowers come in 3 major variants manual, petrol and electric. Manual lawn mowers require a considerable amount of manual effort for the grass trimming. The electric and petrol lawn mowers on the other hand require almost no manual effort for the work. Lawn mowers can cut the grass at multiple levels and there is height adjustment option available in many models which can cut the grass at different height.