Question
If you have a domain, you've tangled, at least marginally, with DNS. To understand how DNS works, read http://web.grinnell.edu/individuals/...nsoverview.htm
That one gets a little technical, especially when it talks about reverse lookups. Just ignore the jargon and go for the general principles.
A good explanation of what happens when you browse: http://www.stamey.nu/DNS/DNSHowItWorks.asp
DNS as it relates to your domain name: http://www.webhosters.com/c/a/Web-Ho...-take-so-long/
Answer
Here is another everyday explanation of DNS.
http://support.netcentral.co.uk/doma...ame_system.htm