A bulldozer or dozer is a large, motorized machine equipped with a metal blade to the front for pushing material: soil, sand, snow, rubble, or rock during construction work. It travels most commonly on continuous tracks, though specialized models riding on large off-road tires are also produced. Its most popular accessory is a ripper, a large hook-like device mounted singly or in multiples in the rear to loosen dense materials.
A large bulldozer with multi-tine ripper, the Caterpillar D9
A Liebherr bulldozer with a straight blade
The same bulldozer's multishank ripper
Bulldozer blade
Construction is a general term meaning the art and science of forming objects, systems, or organizations. It comes from the Latin word constructio and Old French construction. To 'construct' is a verb: the act of building, and the noun is construction: how something is built or the nature of its structure.
Construction site and equipment prepared for start of work in Cologne, Germany (2017)
Industrial assemblage of a thermal oxidizer in the United States
Military residential unit construction by U.S. Navy personnel in Afghanistan
Units under construction in Brighton, Victoria, Australia