Video Card Ports
There are several ways the computer graphics card transfers the signal to the monitor. The older and most common way is through the VGA (Video Graphics Array) port. More recently the DVI (Digital Video Interactive) port has been used.
Some computer graphics cards have both of these ports on the one card allowing two monitors to be connected at the same time. S-Video (TV Out) ports have also become more common on computer video cards. These can be connected to through the S-Video In port of a TV thus turning a TV into a computer monitor.