We can think of DNS as being like a phone book. Those people we want to call frequently, we usually either know their numbers or have their numbers on speed dial/saved on our cells/etc. But sometimes we need to call someone that isn't in our speed dial or memory. That is where the Domain Name System comes in. When we, for example, type in google.com into our web browser, our service provider sends that address to a (usually our ISP's) DNS server, which then looks at the info "google.com" sent to it, looks it up and says, "it's IP address is 74.125.45.100," and sends that info back to your home computer. Your computer then knows where to find the Internet resource.
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