A name that identifies an IP address. For example, the domain name microsoft.com represents the IP address 18.104.22.168. Domain names are used in URLs to identify particular Web pages. For example, in the URL http://www.sandybay.com/pc-web, the domain name is sandybay.com.
Every domain name has a suffix that indicates which top-level domain it belongs to. There are only a limited number of such domains. For example:
Because the Internet is based on IP addresses, not domain names, every Web server requires a Domain Name System (DNS) server to translate domain names into IP addresses.