What's the difference between a laser light, a searchlight and a projector?

Laser lights are generally divided into industrial laser lights and entertainment laser lights. Industrial laser lights, such as the colorful beams of various patterns you saw at the Spring Festival Evening, are emitted by laser lights.

A searchlight is a combination of a high-power light bulb and a concave mirror in a specific direction. Used in high-rise buildings, hotels, stadiums, parks, amusement parks, scenic spots, star concerts, etc. And play a warning role in wartime.

Projectors are used to watch movies.