Short for Domain
Name System or Domain
Name Service, a DNS is
an Internetor network server that
helps to point domain names or hostnames to their associated Internet
Protocol address. It was introduced by Paul Mockapetris and Jon Postel in1983.
Without a server to resolve a domain name or the
proper rights, users would have to know the IP address of each of the web pages
or computers you wanted to access.
Note:
If a domain name is not found within a local
database, the server may query other domain servers to obtain its address.
Tip: DNS uses port 53.
How does it work?
When a user wants to visit Computer Hope, they would
type "www. m-itacademy.blogspot.com"
into the address bar of their browser. Once that domain name has
been entered, it is looked up on a Domain Name System where it is translated
into an IP address that is more easily interpreted by a computer, e.g. 216.58.192.33. Using that IP address, your
computer can then locate the Computer Hope web page and forward that
information to your browser.
Computers and other network devices on the Internet use an IP address to route your request to the site you're trying to reach. This is similar to dialing a phone number to connect to the person you're trying to call. Thanks to DNS, though, you don't have to keep your own address book of IP addresses. Instead, you just connect through a domain name server, also called a DNS server or name server, which manages a massive database that maps domain names to IP addresses.