The "cordless drill" is a common type of drill. They are small enough to be held and used in one hand. They are powered by electricity from a battery. Electricity flows from the battery to an electric motor inside the drill. The electric motor drives a gearbox. The gearbox drives the chuck, and the chuck is holding the bit. The mechanical advantage of the gearbox makes the chuck rotate at a slower speed than the electric motor, but the mechanical advantage also rotates the chuck with more torque. More torque on chuck means more torque on the bit. More torque on the bit means there is more force pushing the cutting teeth through the material. More force pushing the cutting teeth allows cuts to be made faster and into harder materials. Without a gearbox, a hand-held electric drill would spin very fast, but it would only be able to drill through very soft materials.
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