The term drilling refers to a process in which a hole is created by using a rotary tool, such as a drill. This can be done manually or with the help of a machine, and it involves cutting away material from the surface being drilled until the desired depth is reached. Drilling is commonly used for various purposes including creating holes in wood, metal, plastic, or any other materials; installing screws, nails, or bolts; and extracting oil, gas, water, or minerals from the earth through a well.