Domain Name System (DNS) is a procedure that allows users to recognize any site on the Internet through domain names instead of IP addresses. A domain name is a sequence of letters and numbers separated by periods that acts as a pointer to a unique IP address. There are different types of domain names including top-level domains like .com, .org, and country code top-level domains; as well as second-level and subdomains. DNS dates back to the early days of ARPANET when a text file mapped hostnames to numerical addresses and has evolved to be the major backbone of translating human-friendly names to computer-readable IP addresses on the internet.

1. DOMAIN NAME SYSTEM
ALFRED GEORGE(p18170)
B.COM: SACRED HEART COLLEGE ,THEVARA
COMMERCE: TOC-H PUBLIC SCHOOL, VYTILLA

2. WHAT IS A DOMAIN NAME?
 A web domain name is a sequence of letters and/or numbers/hyphens separated by one or
more periods (".") that act as a pointer to a unique numerical address (IP) on a computer
network such as the Internet. DNS (Domain Naming System) is a procedure through which
we can recognize any site on Internet.
TYPES OF DOMAIN NAMES
Top Level Domains(TLD)- includes ccTLD and gTLD
Examples- .au , .com , .org, .biz, .info, .net
Second Level Domain(SLD)- Domain which is directly below TLD.
Example- google is the SLD in www.google.com
Subdomain- example: mail.google.com

3. HISTORY
 DNS dates back to the ARPANET era. The Stanford Research Institute (now SRI
International) maintained a text file named HOSTS.TXT that mapped host
names to the numerical addresses of computers on the ARPANET. Maintenance
of numerical addresses, called the Assigned Numbers List, was handled by Jon
Postel at the University of Southern California's Information Sciences
Institute (ISI), whose team worked closely with SRI.
 Addresses were assigned manually. To request a hostname and an address and
add a computer to the master file, users contacted the SRI's Network
Information Center (NIC), directed by Elizabeth Feinler, by telephone during
business hours.

4. FUNCTION
 An often-used analogy to explain the Domain Name System is that it
serves as the phone book for the Internet by translating human-friendly
computer hostnames into IP addresses. For example, the domain
name www.example.com translates to the addresses 93.184.216.119
FEATURES
• The domain name must be registered before you can use it
• Every domain name is unique. No two websites can have the same
domain name.
• Major backbone of the internet.

5. IMPORTANCE OF DNS
 Computers/networks can only understand numbers. It is difficult to remember
the IP addresses assigned to each website.
 IP addresses change.
 Help visitors to identify and connect with your business idea.
 A unique and attractive domain name can contribute to the success of
business.

6. HOW DNS WORKS!