What different kinds of lawn mowers are there?

A mower is a machine used to cut lawn grass. Before mowers were invented, lawn grass was shortened by scythes or grazing animals. The lawn mower was first invented in 1830 by English inventor Edwin Beard Budding, who patented a manual push mower. Over the years, they have evolved into many forms and can be powered by electric motors or gas engines. They can be push-from-behind mowers or riding mowers. The latter category includes both sit-down and stand-on varieties.

• Reel, or cylinder, mowers have a rotating cylinder comprised of several blades that chop the grass with a scissor-like cut. The Budding mower was actually a reel mower.
• Flail mowers have spinning blades. They are often made to attach to the rear hitch of a tractor. Flail mowers are an excellent choice for areas overgrown with tall grass, vines and brush.
• Some mowers only have a single horizontally rotating blade. 
• A finishing or grooming mower is a specialized lawn mower that gives a smooth, flat finish to an already well-maintained lawn. It generally has multiple blades capable of cutting lower than a standard mower. Because of its large size, a finishing mower is reserved for professional lawn contractors.
• Mowers can also be described by their steering mechanism, such as a zero-turn mower. As its name implies, a zero-turn mower has a turning radius of effectively zero. It can pivot in a circle, making mowing more efficient. That ability makes it a favorite among professional lawn care providers, but do-it-yourselfers with large lawns have begun to purchase them as well, despite their high price tags.