“Each computer connected to the internet has an Internet Protocol (IP) address in the form of a unique number.  Through this number computers locate other computers.  We as human beings rather prefer to use names rather than numbers to find computer sites on the internet.  The “Domain Name System (DNS)” effectively serves as an electronic “phone book” by translating domain names (for example, www.google.com) into IP addresses.  The Domain Name System makes it possible for computer users to enter www and e-mail addresses linked to particular pages and persons they seek into their internet browsers and emails without having to know on which particular computer the page or person is hosted.  A domain name constitutes of one or more parts that are separated by dots, such as www.google.com”

Henney J in Fairhaven Country Estate (Pty) Ltd v Harris (735/2015) [2015] ZAWCHC 100 (8 July 2015) at footnote [1].