Laser engraving operations can be risky because laser beams are hot and powerful when engraving and cutting. Therefore, accidental contact can be dangerous. In addition, laser radiation can damage the eyes. Fumes rising from the surface of the burnt material can also be dangerous.
As such, most engravers have various safety features such as a laser beam enclosure to prevent contact - and a cover to protect your eyes from harsh UV rays. It's a good idea to buy safety glasses and gloves to protect yourself. Also wear a mask when using a laser engraver.