DNS
Domain Name System: the phonebook of the internet that translates domain names to IP addresses.
DNS (Domain Name System) is what allows you to type "google.com" into your browser instead of memorizing 142.250.80.46. When you visit a website, your device asks a DNS server "what is the IP address for this domain?" and the DNS server responds with the correct address. This lookup happens in milliseconds, usually before you even notice. DNS is one of the most critical pieces of internet infrastructure. If DNS is down, websites become unreachable even if the servers are running perfectly.
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