A domain name is a unique name that identifies particular websites or web pages. Because the Internet is based on IP addresses, not domain names, a domain name acts as a mask allowing the general public to easily access the desired IP resource, such as a personal computer used to access the Internet, a server computer hosting a web site, or the web site itself or any other service communicated via the Internet. A domain name is represented by a URL, such as Google.com.
For example, remembering a name like Google.com is easier than remembering the IP address for the same site (220.127.116.11).
NOTE: You can test accessing a site by IP by entering the numbers above into the address bar of your browser.
Every domain has a suffix that indicates which top-level domain it belongs to and every web server, or site, requires a DNS (Domain Name System) server to translate the domain name into its IP address.