USB is a different physical layer that can carry many different protocols including MIDI. DIN MIDI defined the physical layer - connectors, whiting, baud rate, electrical specifications, etc - as well as the protocol - essentially the language in terms of header bytes, address, data, checksum, end of message.what the bytes of data mean and how they should be packaged and read. The original MIDI specification defined both.
I'm not the best expert to try to explain this, but I think a lot of people would gain a better understanding just by being familiar with the OSI model (google it) and in particular differentiating a protocol from a physical layer.
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