The oldest video output is VGA output.
graphics cards are mostly equipped with a 15-pin VGA connector (Mini D-Sub, composed of 3 rows of 5 pins), usually blue, in particular allowing the connection of a CRT. This type of interface used to send screen 3 analog signals corresponding to the components of red, blue and green image.
The evolution of the VGA is the DVI output.
Interface DVI (Digital Video Interface), introduced on some graphics cards, you can send, screens supporting it, the digital data. This avoids the digital-analog conversion, analog and digital unnecessary.
The HDMI output allows you to connect your PC to your TV if it has an HDMI input.
HDMI interface for connecting the card to a screen by transmitting high-definition also the audio (this format is the replacement of the scart). The signal is a pure digital signal.
The VGA and DVI does not transmit the image.
The HDMI transmit image and sound (ideal for display on a television).
There are HDMI to 10 euros.
Source: www.creationdesitesinternet.info / PDF / Le_guide_du_PC_sous_Windows.pdf
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