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The internet is based on IP addresses. to make life easier domain name servers translate something like "facebook.com" to the ip address your computer connects to.
If a DNS server is like "facebook.com? whats that, i have no IP for it", then it won't send you to where you need to go.
This could be a 2-48h outage, that's how long it takes updates in DNS to propagate around the world to all DNS servers.
Just like a mailing address, correct? The IP is the address (i.e., 123 Main St., Fuckville, IL) Whereas what we use (xxx.com) is "the yellow house on the corner of Main St." Not sure if that is correct.
in a basic way, yes it is. However these days the IP address is no longer enough, as you need the DNS for a lot of sites. an IP will send you to the load-balancer which will send you to a load-balanced server. If you try via IP it will give you nothing, DNS plays a big role in this.