A drill rig is a machine that is used for drilling deep holes. The end product of a drill rig's work is called a core or a core sample. Drilling rigs have been around for centuries, but the advent of the internal combustion engine has converted them from human- or animal-powered machines to machines run by diesel engines. In 2008, it was estimated that the top 54 manufacturers in the world had 33,044 units in operation worldwide.
Drills are the main pieces of equipment that engineers and geologists and oil and gas extraction professionals use to extract cores and samples from the earth. The machines were developed long before the internal combustion engine was invented. They were originally created as wind- or water-powered machines to help farmers dig deep holes in various types of ground.
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