A domain name, such as it.wikipedia.org, may be part of a URL, like http://it.wikipedia.org/wiki/Treno, or an e-mail, such as apache @ it . wikipedia.org. These are the tools used to identify a resource on the Internet, which explains the pervasiveness of domain names. Post from: UK Web Hosting | Linux Windows Server Tutorials | PHP MySQL ServiceDomain Name System, DNS | Part 3