I don’t write here the history of HDMI but let me to tell you a short introduction of HDMI. You saw this standard on you new LCD TV. HDMI means High-Definition Multimedia Interface and is a compact audio/video interface for transmitting uncompressed digital streams. To use it you need devices compatible with HDMI standards. And to connect two devices like your notebook to the LCD TV you need a cable, a HDMI cable. If you search for a HDMI cable in near store you will find some high prices for this kind of cables.

But you must know that is no notable differences between cheap hdmi cables and expensive cables. For example you should never pay more than $7 for a 6 Feet- HDMI Cable Male to Male Full HD 1080p 24K Gold Plated.
The HDMI specification does not define a maximum cable length, so you can find 150 Feet- HDMI Cable Male to Male Full HD 1080p 24K Gold Plated (Built-in Equalizer) for $200. HDMI technology has been designed to use standard copper cable construction at long lengths. In order to allow cable manufacturers to improve their products through the use of new technologies, HDMI specifies the required performance of a cable but does not specify a maximum cable length.
HDMI 1.3 has defined two categories of cables: Category 1 and Category to reduce the confusion about which cables support which video formats.

The HDMI standards define two categories of cables:

Category 1 (Standard) certified cables which have been tested at 74.5 MHz (1080i/720p) and designed to support HDTV resolutions and frame rates.

Category 2 (High Speed ) certified cables which has been tested at 340 MHz (1080p), required for higher WQXGA resolutions (resolution of 2560 x 1600) or higher frame rates.