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A "dongle" is a term used to refer to a device that plugs in that adds some functionality.

I first saw it as part of an authentication system. You had to have a "dongle" plugged into a USB port that told the software you were an authorized (i.e. paid) user.

But it can be generalized. Our Chromecast plugs into an HDMI port. Our ROKU does also. Both are regarded as "dongles".

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