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Guys, a simple Google Search will answer all your questions. VGA can only transfer analogue signals. So when you connect your PC and Monitor using it, 1st PC needs to convert the digital signal to analogue one for transmission, resulting some quality loss. After the signal reaches the Display, it again needs to be converted to digital signal from the analogue source, again some quality loss.
Both DVI and HDMI carry digital signal directly to the display unit from PC and offer exactly same video quality, provided you are using proper version of HDMI and DVI having same data bandwidth. However, HDMI can also carry digital audio along with the Video which DVI-D can't. That's why the LCD TVs have HDMI input so that both audio and video can be sent through a single channel from the devices like Blue Ray players, Media boxes and computer HDMI output.
Both DVI and HDMI carry digital signal directly to the display unit from PC and offer exactly same video quality, provided you are using proper version of HDMI and DVI having same data bandwidth. However, HDMI can also carry digital audio along with the Video which DVI-D can't. That's why the LCD TVs have HDMI input so that both audio and video can be sent through a single channel from the devices like Blue Ray players, Media boxes and computer HDMI output.