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A dongle is a small piece of computer hardware that plugs into a computer or other device to provide extra functionality or to act as an adapter. These functions can include adding wireless connectivity (like Wi-Fi or Bluetooth), providing a new port such as HDMI or USB-C, extending data storage, or securing software licenses. Dongles are often small, portable, and use a plug-and-play setup for easy installation.

Functions of a dongle

Connectivity: Adds wireless capabilities like Wi-Fi or Bluetooth to a device that doesn't have it built-in.

Adaptation: Converts a port from one type to another, such as a USB-C to HDMI adapter to connect a laptop to a monitor.

Storage: Provides external data storage, similar to a flash drive.

Security: Used as a physical "key" to prevent unauthorized use of protected software.

Streaming: Can be used to stream content to a TV or other display.

Common types and uses

Wireless dongles: Provide internet access, often using cellular networks (4G/5G).

Display adapters: Connect a device's display output to different monitor types (e.g., a Mini DisplayPort to VGA dongle).

USB-C hubs: A modern type of dongle that uses a single USB-C port to provide multiple connections, such as USB-A, HDMI, and power.

Security dongles: Protect software by requiring the dongle to be plugged in for the program to run.