Dongle is a generic term for a typically small device that attaches to your computer to provide some sort of functionality, sometimes specific to an application.

USB Dongle
Examples of dongles include:

  • Copy-protection devices that must be attached for an application to work
  • Mobile broadband “modems”
  • External network adapters, wired or wireless
  • Flash drives

Most dongles are USB devices these days, but the term doesn’t actually imply a type of connector. Historically, communications ports, printer ports, and other types of external ports on a computer have all been used.

dongle (Wikipedia)
A Bluetooth dongle that enables Bluetooth functionality on a Computer without built-in Bluetooth

A dongle is a small piece of computer hardware that connects to a port on another device to provide it with additional functionality, or enable a pass-through to such a device that adds functionality.

In computing, the term was initially synonymous with software protection dongles—a form of hardware digital rights management where a piece of software will only operate if a specified dongle—which typically contains a license key or some other cryptographic protection mechanism—is plugged into the computer while it is running.

The term has since been applied to other forms of devices with a similar form factor, such as adapters that convert ports to handle different types of connectors (such as DVI to VGA for displays, USB to serial connection, and in modern computing, USB-C to other types of ports, and Mobile High-Definition Link), USB wireless adapters for standards such as Bluetooth and Wi-Fi (the term "stick" or "key" is more commonly used to describe USB flash drives, as well as modern forms of dongles with slimmer form factors more akin to flash drives), and small form-factor digital media players that plug into HDMI ports.

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