Today, many of us are in the process of removing their CRT TVs and shopping for the new hype in the TV market –High Definition TVs. And if you happen to be one of them, you surely would have come across the term HDMI. Not only TV, HDMI port is available on home theatres, play stations, HD-DVDs and many others.The difference between a HDTVs and old TVs( also, now known as standard definition TVs) lies in the technology. Older TVs were analog, whereas HDTVs are digital. Older TVs used interlacing, aspect ratio of 4:3 and picture resolution of about 704 X 480 pixels. HDTVs use progressive scanning, aspect ratio of 16:9, picture resolutions up to 1920 X 1080 pixels. In other words, HDTVs use higher refresh rates, wider displays as well as enhanced picture resolution. What this implies is that HDTVs require higher amount of data to be processed and also at a faster rate compared to standard TVs.