An HDMI splitter is an interface device featuring one HDMI input port and two or more HDMI output ports (commonly 1x2, 1x4, or 1x8 configurations). It accepts an incoming audio/video signal from a source—such as a gaming console, streaming box, Blu-ray player, or PC—and sends identical copies of that signal to multiple displays (TVs, monitors, or projectors) at the exact same time.