A manual can opener is a handheld tool designed to open metal cans. It typically consists of a rotating cutting wheel and a handle. Users place the cutting wheel on the can's lid, squeeze the handles together, and turn the handle to pierce and cut through the metal. These can openers are simple to use and do not require electricity, making them a reliable option for kitchens. They come in various designs, including the classic church key style and the more modern safety can opener, which minimizes sharp edges for safer handling.