An HDMI cable is a familiar term if you have or shopped for an HDTV, a Blu-ray player or a PlayStation 3. It is more than just a connection or port on the back of a TV or a hardware device. Before HDTVs came along, the standard televisions showed pictures in what was known as the 'standard definition'. This meant that the aspect ratio of the picture was 4:3, or roughly square with 704 x 480 pixels as resolution. The moving images were actually not complete, just half of the picture was visible but since the images changed quickly, the human brain was not able to tell the difference. Also older televisions worked on analog signals

HDTVs work on digital signals, the aspect ratio is 16:9 and the picture is more rectangular instead of the conventional square pictures. The resolution is high, allowing up to 1920 x 1080 pixels. Each frame of the moving picture is a whole rather than a half. The screens of HDTV are wider, there are more pixels and the pictures refresh quickly. The colors on display are also more than regular television. This implies that HDTVs need more data to process faster than a standard definition TV. The HDMI (High-Definition Multimedia Interface is a set of guidelines for creating high-bandwidth links between digital devices.

An HDMI cable can cut down the need for cables that are required to connect components of an electrical system. With this cable, you get unmatched picture clarity and sound, which can be lost if the media is converted from digital to analog and the back to digital. Here the connections are kept only in the digital format of 1s and Os. The HDMI cable can also carry 3D video signals from your Blue-Ray 3D player to your 3D TV.

These cables are made of 19 distinct wires in a single cable that look more like a USB cable. The HDMI cable has a transmission bandwidth of 5 GB per second. This means it uses less than 50 percent of available bandwidth for these devices. This means an HDMI cable can incorporate a lot of technological developments as they happen in future.

Though the length of the cable that you want to buy is your discretion, with increase in the length of the cable, the signal quality can decrease. An HDMI cable that is 2 meters is good enough and if it can muster up to the signal strength of up to 1080p, it means you have a good product in hand.

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