The sockets have changed over time, but no matter what you plug, the host computer always seems to know what the device is.īut how exactly does that happen? How does it know when a mouse has been connected, and not a printer? What's the difference between USB 2.0 and USB 3.2 SuperSpeed? All we've ever needed to do was plug them in and watch it all magically work. For 25 years, the USB port has been a faithful old friend, connecting and powering our everyday gadgets and peripherals.
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