If you have lawn in your garden then you should probably need a lawnmower. When you buy a lawnmower you should take into account the size of your lawn and what kind of cut it requires. If you have a small area of lawn then a manual lawnmower will be enough but if you have a larger area of lawn you should buy a powered one.
Powered mowers can be cylinder, rotary or hover. Cylinder mowers are good for the finest cut, rotary ones are good for long and over-grown grass and hover mowers are best for irregular lawns. As grass need to be cut more closely in summer than in winter you should check that the height of cut is easily adjustable.