what is Domain name system...

The Domain Name System (DNS) is a system used on the internet for translating names of domains and their publicly advertised network nodes into IP address. A domain name is a group of computers that are associated by their geographical location or their business type. A domain name is string of characters, number, or both. Usually a name or abbreviation that represents the numeric address of an internet site will make up the domain name .There are more than 200 top-level domains on thee internet. The example of which include
;us-United States
;uk-United Kingdom

There generic names this example:
; edu-educational sites
; com-commercial sites
; gov -govermernt sites
; org- non-profit sites
; net-network service