What exactly is ROON?

I was going to write it out but honestly it's all here:

https://roon.app/en/how-roon-works

While it’s ultimately software that can run on your computer, it runs best on Roon’s own server, the Nucleus.

and you need hardware optimized for Roon

I had it for a while but didn't really use it much. I confess I can't sit still for streaming music (or CDs for that matter) for very long before I am distracted and lose interest. 

The people who do like it seem to REALLY like it though so your mileage may vary.

I think if you like reading liner notes you would like Roon.  If you don’t know what liner notes are because your music appreciation evolved with iTunes you can read about them here:

https://www.merriam-webster.com/dictionary/liner%20notes

 If you don’t know what liner notes are because your music appreciation evolved with iTunes

This might be the greatest sentence (or partial sentence) ever posted on here!