An HDMI switch is used to connect more than one device (DVD player, xbox, pc, etc) to a single HDMI port on your HDTV. Switch between multiple HDMI sources with just the push of a button on the switch or remote.

Note: If you would like to mirror a single HD source device to multiple displays, you need an HDMI splitter: http://www.cabletrain.com/adapters-splitters/hdmi-splitters