Windows 10: What is "Digital Audio S/PDIF"?

Hello I have a question, after I resolved a problem of my PC, I reinstall AMD drivers and after it install it. In "Sound" a playback option called "Digital Audio S/PDIF" appears. What it do? And what thing can do with it?

:)

 

Audio device detected as Digital audio (S/pdif) high definition audio device (NO AUDIO)

My audio device used to only be named High quality audio device but after moving to another part of my house I was presented with the new audio name (Digital audio (S/pdif) high definition audio device) and now I have no audio

 

LG TV sound drops out and switches to Digital Audio (S/PDIF). Resulting in having to restart constantly.

My desktop, which is running Windows 10, is hooked up to my LG 60" TV. Constantly I have to restart the computer when it kicks into Digital Audio (S/PDIF). I've checked system settings to see if I can switch back, I've updated drivers, and reinstalled drivers. I've checked many forums with no success. Any suggestions?

 

How to select PCM stereo output for digital audio S/PDIF jack?

I am looking to upgrade the sound from my PC. I wish to bypass the sound card of my computer by plugging in a digital-to-analog converter (DAC) in a USB 2.0 port. I've learned I can stream digital audio that way by selecting my DAC as the default audio output
device. However, the DAC I am considering also can stream data from the digital optical output on my PC to the DAC. A tech rep for the DAC told me to stream music from both the optical output
and the USB port alternatively and see which sounds better. However, for the DAC to utilize the digital optical jack it must be set to pulse-code modulation (PCM) stereo output.

Hence my problem. I see no menu option for selecting PCM stereo output as opposed to DTS or Dolby multi-channel audio in my sound controls for the optical output (in the "Supported Formats" section of the "Digital Audio S/PDIF Properties" menu. (Microsoft
WMA Pro Audio is also offered in that menu, but I don't know what that is or if it changes the digital optical audio output to PCM format.) I would like to utilize the digital optical output from my PC as the DAC rep suggested if at all possible. Please advise.