What's the difference between a slide and a projector?

Different working principles, different weights and maneuverability.

1, the working principle is different: the slide is based on the principle of convex lens imaging, which converts transparent and colorful pictures (slides) into images through the projector and projects them on the screen; On the other hand, projectors use digital technology to process images through electronic signals and project them directly onto the screen.

2, the weight and mobility are different: the traditional slide is made of metal, which is relatively heavy and needs to be connected to a power socket to use; Modern projectors are small in size and light in weight, and can be easily carried to various occasions for use.