Rotary drilling is a method used to create holes in the ground, primarily for extracting resources like oil, gas, or water. This technique involves a rotating drill bit that cuts through various types of soil and rock. The drill is powered by a motor, and as it turns, it advances deeper into the earth. To assist in the drilling process, a fluid known as drilling mud is often used. This fluid helps cool the drill bit, removes cuttings from the hole, and stabilizes the walls of the borehole. Overall, rotary drilling is an efficient and widely used technique in the resource extraction industry.