I would guess that John is referring to a USB extension lead which come in a variety of lengths if you shop around.
I have often joined several USB extension leads together so that i can put a piece of equipment in a more favourable place because it is impracticale to put the PC/Laptop in that position.
I put the webcam outside the van for example on lots of extensions so that it can be used as a kind of security cam.
Roger
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