Red, green and blue (RGB) ports support colours and colour signals that are displayed on a computer monitor. Though RGB ports are called video graphics array (VGA) ports, at least one RGB port exists with a structural difference.
Most VGA ports have five pins each in three rows, totalling 15 pins.
VGA ports, also called DE 15 or HD 15 connectors, have three rows and 15 pins. These are found on some PC-video ports for some brands of 18-inch LCD monitors.
The analogue RGB connector on an LCD screen is used to connect the monitor to a computer -- which is an RGB video input source. Likewise, the VGA port is an analogue port connecting the monitor to a computer.