Which video interface supports only analog signals?

The Video Graphics Array (VGA) interface is designed specifically for transmitting analog signals. Introduced in the late 1980s, VGA became a standard for connecting monitors to computers. It uses a 15-pin D-sub connector and is capable of supporting various resolutions and refresh rates; however, it does so by sending analog signals, which can lead to potential issues with picture quality, especially over long distances or with poor cabling.

In contrast, other interfaces such as HDMI and DVI primarily transmit digital signals, and even the composite video interface, while also analog, is typically regarded as lesser in terms of quality compared to VGA. VGA's design and purpose distinguish it as the option among the choices that solely operates with analog signals.