DNS, the distributed architecture of resolving an Internet domain name to an IP address , was invented 25 years ago. I wouuld say DNS is the most important application ever built in the Internet. Without that, web browsing, sending of email, online chat, MSN etc will all fail.
Today, DNS serves more than just look up domain names into IP addresses. There are other sophisticated functions served by DNS :
1. Routing mail by means of MX records
2. Backing up email delivery by way of preference level in MX records
3. Suppressing spam by way of Sender Policy Framework and Domain Keys
4. Suppressing spam by way of reverse IP lookup
5. Load balancing and server distributions by way of DNS round robin
6. Supporting VOIP by way of ENUM
Anymore ? There should be some more …
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