How does the HDMI videocard output carry the sound?

[Teeborg]

I'm just curious about it and I can't find anything. Any article, information, enlightment is much apritiated

 

[americanaudiophile]

HDMI was designed to carry digital video and audio from the beginning for consumer products. It's only in the computer world that it is optional.
http/www.webopedia.com/TERM/H/HDMI.html