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A bulldozer is a large motorized machine that travels on tracks and is equipped with a metal blade to the front for pushing material: soil, sand, snow, rubble, or rock during construction or conversion work. Bulldozers are also called crawlers. When needed, a hook-like device (termed a ripper) can be mounted on the rear to loosen dense materials. Bulldozers can be found on a wide range of sites, mines and quarries, military bases, heavy industry factories, engineering projects, and farms. The word "bulldozer" refers to only a tractor fitted with a dozer blade. The word is sometimes used inaccurately for other earth moving equipment such as front loaders.

ypically, bulldozers are large and powerful tracked heavy equipment. The tracks give them excellent ground-holding capability and mobility through very rough terrain. Wide tracks help distribute the bulldozer's weight over a large area (decreasing ground pressure), thus preventing it from sinking in sandy or muddy ground. Extra-wide tracks are known as swamp tracks or low ground pressure (lgp) tracks. Bulldozers have transmission systems designed to take advantage of the track system and provide excellent tractive force.

Because of these attributes, bulldozers are often used in road building, construction, mining, forestry, land clearing, infrastructure development, and any other projects requiring highly mobile, powerful, and stable earth-moving equipment.

Another type of bulldozer is the wheeled bulldozer, which generally has four wheels driven by a four-wheel-drive system and has a hydraulic, articulated steering system. The blade is mounted forward of the articulation joint, and is hydraulically actuated.

The bulldozer's primary tools are the blade and the ripper.

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