A manual can opener is a handheld tool designed to open metal cans. It typically consists of a rotating cutting wheel and a handle. To use it, you clamp the opener onto the can's rim, turn the handle, and the wheel cuts through the metal, allowing the lid to be removed safely. These can openers are often made of stainless steel and plastic, making them durable and easy to clean. Unlike electric can openers, manual versions are portable and do not require batteries or electricity, making them ideal for camping or emergency kits.