A HDMI to VGA cable is a type of cable that allows you to connect a device with an HDMI output, such as a laptop or DVD player, to a display or monitor with a VGA input. The HDMI end of the cable plugs into the HDMI output on your device, while the VGA end plugs into the VGA input on your display. This type of cable is commonly used when you need to connect newer devices with HDMI outputs to older displays or projectors that only have VGA inputs. It allows you to transmit video signals from the HDMI source to the VGA display, but keep in mind that VGA does not support audio transmission, so you may need a separate audio cable or adapter for sound.