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VGA is analog. DVI digital. VGA analog cannot be converted to DVI digital with a cable. DVI-A is an odd animal, using a DVI style plug for an analog signal. It is not digital. A video card may have a DVI-A output in addition to a DVI-D output, the first being for people that have an analog only monitor. This cable connects to the DVI-A analog output on the card and the VGA input on the monitor.VGA is analog. DVI digital. VGA analog cannot be converted to DVI digital with a cable. DVI-A is an odd animal, using a DVI style plug for an analog signal. It is not digital. A video card may have a DVI-A output in addition to a DVI-D output, the first being for people that have an analog only monitor. A specific cable connects to the DVI-A analog output on the card and the VGA input on the monitor while traditional analog video cables are D-sub 15 on both ends.