<human>: What is the difference between an electric and a cordless drill?
<bot>: The main difference between an electric and a cordless drill is that an electric drill requires an external power source, such as electricity from a socket or battery pack, while a cordless drill uses its own built-in rechargeable battery. Additionally, electric drills are typically heavier than their cordless counterparts, due to the additional weight of the motor. Cordless drills also tend to be quieter than electric drills, since there's no need for an external power source.