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Definition: HDMI dongle

A small device that plugs into the HDMI port of a TV set and provides Wi-Fi streaming from the home network. It is designed to access movie content from the Internet but may also enable local content to be displayed.

Roku Streaming Stick
The Roku Stick is an MHL-compliant device that provides the same capability as the Roku streaming boxes (see Roku and MHL).

Google's Chromecast
Plugging into the TV's HDMI port, Chromecast streams content from the home network via Wi-Fi. See Chromecast. (Images courtesy of Google Inc.)