Human: What are the differences between a sandblaster and a sander? Assistant: 
The main difference between a sandblaster and a sander is that a sandblaster uses compressed air to blast abrasive materials such as sand or glass beads at high speeds against a surface, whereas a sander uses a rotating abrasive disk or belt to smooth and shape a workpiece. Additionally, sandblasters typically have an open-air design while sanders tend to be enclosed units with dust collection systems.