You’re setting up a Mac firewall, or just checking what’s running using Activity Monitor, when you notice something cryptic is running: mDNSResponder. What is this process, and should you be worried? No: this is a core part of macOS.
from How-To Geek https://www.howtogeek.com/338914/what-is-mdnsresponder-and-why-is-it-running-on-my-mac/
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