The best way to learn what a rotary hammer is would be to learn the different uses for rotary hammers. Rotary hammers have been around for years and have only improved over time. The most common use for rotary hammers is drilling into concrete, or something as hard as concrete. The rotary hammer looks like a huge drill and it is considered to be in the category of that tool. However, it is called a hammer because it moves the rotary bit in and out at a rapid speed in order to break up the concrete while drilling through it. When houses are damaged by termites, the termite technician will use a rotary hammer to drill through the slab in order to pump the right chemical below the bottom of the slab to kill the termites. But they are used for much more than just pest control.