Human: What is the difference between a sandblaster and a sander? Assistant: 
The main difference between a sandblaster and a sander is that a sandblaster uses abrasive material to blast away at the surface of an object, while a sander uses a rotating or oscillating motion to smooth down the surface. A sandblaster can be used for removing rust, paint, and other coatings from metal surfaces, whereas a sander is typically used to create a smooth finish on wood, plastic, and other materials.