How to change the DNS address in Windows 10 and 11
Briefly

Your ISP's name servers can normally provide a very fast response, but if overloaded or congested, you could still experience slow service.
Changing your DNS can enhance security; cybercriminals can hack poorly managed name servers, causing redirection to malicious sites, so consider a trusted server.
Some DNS operators maintain lists of harmful sites and block attempts to connect to them, providing instant protection against phishing scams and online dangers.
Online devices usually have a primary and secondary DNS address configured; if the primary DNS is slow, the device will try the secondary.
Read at ITPro
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