For example, if a cable box or PC has DVI out, but the TV or monitor only has HDMI in, a DVI-to-HDMI adapter cable is used to connect the video. The audio must be cabled separately as DVI ...

There are multiple monitor ports available, such as VGA, DVI, HDMI ... external doc then you can get USB to HDMI Adapters. They can be connected to your computer via USB and to the Monitors ...