A meat grinder is an appliance that minces or chops meat. Meat grinders can be hand-cranked or powered by an electric motor, and come in a wide range of sizes.
Meat grinders usually have a funnel for inserting the meat. The meat is then fed into a screw conveyor that pushes meat toward the blade and the fixed-hole plate that it is forced out through. There are also special meat grinders that are designed to process frozen blocks of meat. It's also possible to buy a meat grinder attachment for most brands of stand mixers. Meat grinders have a hard time with sinew and connective tissues, so it's best to remove those before using one.