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What is a DNS Resolver?

A DNS resolver is a server that translates human-readable domain names into the IP address computers use to communicate. When you type a website address into your browser, the resolver is the first stop in the lookup process, working behind the scenes to find the correct destination. 

The process begins the moment you request a page. The resolver queries a chain of DNS servers, starting with cached results if available, then reaching out to authoritative servers until it locates the IP address tied to that domain. Once found, the address is returned to your browser, and the connection proceeds. 

Most users rely on a resolver provided automatically by their ISP, though public alternatives from providers like Google or Cloudflare are widely used as well. Public resolvers can offer faster response times or additional features like malware filtering. 

Because every website visit starts with a DNS lookup, resolver performance directly affects how quickly pages load. A slow or unreliable resolver adds latency to every request, even before any actual content begins transferring.