Red, green and blue (RGB) ports support colors and color 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, totaling 15 pins.
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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 analog 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 analog port connecting the the monitor to a computer.