The Hood (US)/Bonnet (Europe)

In front of most front windows on vehicles are what's called a hood in the United States and much of English-speaking North America, or a bonnet in English-speaking Europe. Most hoods lift up in the front, but some open up backwards or (in the case of many racing cars) only held on with pins.

A carbon fiber hood for a new BMW.

Sometimes hoods have intake scoops which can either be just for aesthetic purposes, additional engine bay cooling, or extra performance by means of ram air. In vehicles with an engine in the front, the engine will be under the hood, but if the engine is behind the driver, it will be found under the trunk/boot, and the hood will either be fixed to the vehicle or conceal a storage compartment.