The word tonneau is French, meaning 'cask' or a large barrel like container made of wood, metal, or plastic, used for storing liquids, typically alcoholic drinks.

A tonneau (US: /t??no?/ or UK: /?t?no?/) - that is how it is spelled - is traditionally an auto term for the area of a truck or car behind the driver that is open at the top. A tonneau can be used to store cargo or people.

The term was originally used to describe an open passenger compartment behind the driver. It was rounded and open - manufacturers back in the day incorporated the tonneau into the designs.

A tonneau cover describes the device to cover up and protect whatever is stored in the tonneau - passengers in a car or cargo in a truck or pickup truck.

Today, the term is primarily used to describe the cover of the back of a pickup truck. Tonneau covers come in a variety of styles, materials and covers.

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