iCloud Private Relay DNS queries / Private domains

The document and video session mentioned that:

Private Relay protects:users' web browsing in Safari / DNS resolution queries /..

Not applicable traffic:Local network connections / Private domains /..

  1. What's the meaning of these above?
  2. for example, if I use chrome browser and it has DNS resolution queries, will use Private Relay? or Only in Safari?
  3. Local network connections? If my iPhone connect to the Wi-Fi?
  4. What's Private domains?

Thanks,

iCloud Private Relay DNS queries / Private domains
 
 
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