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There's full size usb, mostly just used for printers now and external drives, mini usb, which is an inbetween size (my gopro3 is the only thing I have left that uses it) and Micro which almost everything uses now. There is the usb-c which is quite new as well.
You didn't say what you want it for so it's hard to give advice. You'll need to make sure it's the right type (full, mini, micro) and provides enough power to charge your device.
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