DNS (Domain Name System) is, in essence, a database that links common names (known as host names) like http://www.webcentral.com.au to a specific, unique IP address, such as 220.127.116.11. Linking IP addresses to names isn’t all DNS is responsible for; DNS has many more features in addition to host-name-to-address mapping.
Records are also maintained by DNS for other purposes. DNS contains a number of record types that facilitate other applications. The Mail Exchanger (MX) record, for example, provides mail servers with the information required to forward e-mail messages to the recipient's email server. Another type of record, the service (SVC) record, is used by Microsoft Active Directory to locate network services.
DNS in action
Below we can see a small diagram outlining one of the most basic tasks of browsing to a website. Keep in mind that this all happens within the blink of eye.
I suggest checking out this article "Domain names" on what domain names are and why you should have one. Alternatively you can contact our sales team on 1800 800 099, Option 1 and speak to someone directly.