The main difference between these two types of lines is the difference in transmission mode. VGA cable is used to transmit separate analog video signals, while HDMI HD cable is used to transmit digital audio and video signals. In terms of usage and compatibility, HDMI HD cable is much better than VGA cable in use and transmission effect.HDMI hd line refers to the high definition multimedia interface cable, can efficiently transmit uncompressed high-definition video and multi-channel audio data, the highest average transmission rate can reach 5 GBPS, can be directly on the signal transmission, without / / a signal conversion, can guarantee the transmission process does not produce detail signal loss or signal quality. VGA cable is a video transmission cable mainly applied to the graphics card interface. Almost all graphics cards have VGA cable interface, and its function is mainly to output image signals for the display end.