Simple explanation of DNS(Domain Name Server)
Everything on the ‘net is really done by IP addresses: sets of 4 3 digit numbers. Kind of like phone numbers. For example, my domain is really 69.93.235.194.
But that’s a pain to keep track of. So we give some IP addresses names. The DNS is a directory assistance service that tells you the IP number for a domain name. So when you look at www.moonwaves.com, your browser asks a DNS “what’s the number for www.moonwaves.com?” the DNS answers “69.93.235.194″ and your browser connects to 69.93.235.194.
When the DNS is down, your browser can’t get the IP numbers.
I’m glossed over a bunch of things that people who know about these things consider important in order to keep it simple, but that’s the gist of it.