First there was VGA, Video (or Component), S-VHS and Scart connectors. All of which use analog signals. Analog signals means that we don’t need any kind of computer to process images (and sound). All we need is old-fashioned electronics or even just a piece of paper and a needle. Today when “everything” has gone digital we have got two new standards called DVI and HDMI.
Though HDMI is the new all-round standard of connecting Computers and TV (and soon every gadget and appliance ) you will still come across DVI. Especially when connecting your computer to your flat screen monitor, TV or Projector.