NextDNS is encrypted DNS. DNS is like using your neighbor across the street for all your directions, except you have to shout.
"YO, WHERE'S THE GROCERY STORE AGAIN? ALSO AFTER THAT I'M VISITING THE STRIP CLUB, AGAIN."
NextDNS turns that shout into a signal/telegram message, to a different neighbor. There's still a neighbor involved, but at least the neighborhood doesn't get to hear anymore.
If they include DNS in the onion routing scheme, it turns into a game of telephone, where the neighbor doesn't know you anymore.
"YO, WHERE'S THE GROCERY STORE AGAIN? ALSO AFTER THAT I'M VISITING THE STRIP CLUB, AGAIN."
NextDNS turns that shout into a signal/telegram message, to a different neighbor. There's still a neighbor involved, but at least the neighborhood doesn't get to hear anymore.
If they include DNS in the onion routing scheme, it turns into a game of telephone, where the neighbor doesn't know you anymore.
Your traffic, and directions become more private.