What is the most widely used interface standard for digital audio and video?

The most widely used interface standard for digital audio and video is High Definition Multimedia Interface (HDMI). This standard was developed to provide a single cable solution for transmitting both high-definition video and multi-channel audio, making it a popular choice for consumer electronics like televisions, projectors, gaming consoles, and Blu-ray players.

HDMI supports various video resolutions and formats, including standard, enhanced, and high-definition video. It also supports multichannel audio formats, which enables high-quality sound transmission along with high-definition video. HDMI's ability to carry both audio and video signals in a single cable simplifies connectivity, reduces cable clutter, and enhances user experience in digital home entertainment setups.

Additionally, HDMI has evolved through several versions to support emerging technologies such as 4K and 3D video, as well as advanced audio formats. This adaptability has further cemented HDMI's position as the dominant interface standard in home theater and multimedia operations, distinguishing it from other interfaces that may serve more specialized functions or lack the same level of widespread adoption and compatibility.