The Hummer H1 is a civilian off-road vehicle

Off-road vehicle

An off-road vehicle is considered to be any type of vehicle which is capable of driving on and off paved or gravel surface. It is generally characterized by having large tires with deep, open treads, a flexible suspension, or even caterpillar tracks...

 based on the M998 Humvee, which was created by AM General

AM General

AM General is an American heavy vehicle manufacturer based in South Bend, Indiana. It is best known for the civilian Hummer and the military Humvee, that is assembled in Mishawaka, Indiana...

. The vehicle was produced from 1992 through 2006, and was the first of what became the Hummer

Hummer

Hummer was a brand of trucks and SUVs, first marketed in 1992 when AM General began selling a civilian version of the M998 Humvee. In 1998, General Motors purchased the brand name and marketed three vehicles: the original Hummer H1, based on the Humvee; and the H2 and H3 models that were...

 line. It was initially known only as the "Hummer"; however, in 1999 in a joint venture between General Motors

General Motors

General Motors Company , commonly known as GM, formerly incorporated as General Motors Corporation, is an American multinational automotive corporation headquartered in Detroit, Michigan and the world's second-largest automaker in 2010...

 and AM General, GM began marketing the Hummer H2

Hummer H2

The Hummer H2 is an SUV and SUT that was marketed by General Motors under the Hummer brand. It is a large truck , while longer, heavier , and taller with room for six passengers , seven passengers in some models. The rearmost part of the H2 SUV was modified to a pickup truck bed for the 2005 H2 SUT...

, which was built on the Chevrolet Tahoe

Chevrolet Tahoe

The Chevrolet Tahoe are full-size SUVs from General Motors. Chevrolet and GMC sold two different-sized SUVs under their Blazer/Jimmy model names through the early 1990s. This situation changed when GMC rebadged the full-size Jimmy as the Yukon in 1992...

 chassis. It was at this point that the original Hummer was given the H1 designation.