What is a PS plate and what is the difference between a PS plate and a film? And what does plate making mean?

Film is a printing machine, it is the computer designed things like a photo negative (negative) out? Yes, and there are a few colors out of a few sheets of film, if there are five colors, film sheet out of five, there are spot colors on the more out of a sheet, then it is 6, the sun PS version is to the final printing, it has no connection with photoshop software, ps version is a piece of iron. Printing is to rely on this PS version. Plate making should be the design of the layout, I am not very clear.