Hummer is a brand of large off-road vehicles (H1) or sport utility vehicles (SUVs) (H2, H3, H4) sold by General Motors, also known as GM. The Hummer is one of the larger 4x4 types, with commensurate high fuel consumption. In most countries, a Hummer is considered to be a truck, rather than a regular SUV as it does not meet environmental protection standards.