Computers and other devices communicate using IP addresses to identify each other on the internet.
But humans can't remember IP addresses, so they use words.
The domain name system (DNS) brings the two together and gets you to your destination.
This is how DNS works
Wait! What? A new request for me? This guy has nothing better to do than to browse around all day.
Let me check if I know about dnsimple.com first, before I annoy the OS again
*sigh*... nothing
Hey OS! Are you there? I need a quick favor from you. Do you know where I can find dnsimple.com?
TOO_BUSY_ERR
Doing a backup
puh-puh-puhlease? Can you check?
Checking now...
Nope. I don't know where it is...
...But I know who to ask...
RESOLVER
The browser and the OS both searched their cache first to see if they knew the IP for dnsimple.com. But since they didn't, the OS is calling the resolver.
Who is that mysterious resolver guy? What will he do?
