A drill rig is a machine that is used to bore holes in the earth. Drill rigs can be used for a variety of purposes, including oil and gas exploration, water well drilling, geotechnical and environmental drilling, mining exploration, and construction. Drill rigs are made up of several components, including a drill string, a power source, a rotary table or top drive, and a traveling block or mast. The power source provides torque to rotate the drill string, while the rotary table or top drive is responsible for turning the drill bit. The traveling block allows the drill string to be lowered and raised, and can also be used to provide additional power. Different types of drill rigs are used for different applications, and they can range from very small portable units to large, heavy-duty rigs used for deep drilling operations.