HDMI stands for High-Definition Multimedia Interface—a fancy name for a type of high definition digital connection that can transmit both audio and video signals over the same cable. Most new HDTVs have at least a couple HDMI jacks, but you may have more than two external devices to connect to your TV—so it helps to know what HDMI is typically used for.
Because HDMI cables can handle transmitting high-definition video and high-resolution audio, they’re typically used to connect HD devices like Blu-ray and DVD players, DVRs, and gaming systems. But how you choose to connect your devices really comes down to personal preference and what input ports you have available.
The great thing about HDMI connections is that they’re easy to connect. Simply connect the one end of the HDMI cable into one of your TVs HDMI input ports and then connect the other end into your HD device’s output ports.
As far as buying HDMI cables, one last thing to note—the industry consensus is that the more expensive cables are no better at transmitting HD video and audio than the less expensive kind. So, do yourself a favor and save your money.