|USB : USB Classes USB Classes for Microcontrollers|
When you think about actually making two computers (like maybe the big processor inside your PC and a small microcontroller inside a USB peripheral) communicate with each other, the first problem you have to face is:
What are you going to have them say to each other?
There's a big fancy name for the solution to that problem: it's called a protocol. It's sort of like a script: what is each side going to say to the other side, and when?
A USB Class is sort of like a protocol: it's a collection of rules that govern how the Host and the Peripheral device will talk to each other, and what they will say under what circumstances.
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