Different type of drills are made to serve different purposes.
Drill types are mainly the regular drill, the hammer drill, and the impact driver.
To serve tougher tasks, a tougher drill is made and given a unique name.
A regular cordless drill is a battery powered device used for fastening or driving purposes. They comprise of a mechanism that simply rotates the bit as the bit screws or drives the surface being worked on. They are very common at homes as well as work places, serving a great deal in putting worn-out hangers or cupboards in place or making new home furniture. These devices have limitations as they won’t be able to deliver once the bit starts witnessing resistance. For this reason a Hammer drill was made.