What is the difference and principle between high-speed camera and high-speed camera?

The camera directly projects the light and shadow in the lens onto the film and images it by chemical means.

The camera converts the light and shadow in the lens into photoelectric signals through sensors and stores them on magnetic tape, or converts them into digital signals and stores them in memory or hard disk.

That's about it.

At high speed, cameras record more films in the same time unit than ordinary cameras, while cameras record more frames per second than ordinary cameras.