What is Domain Name System (DNS)?
https://www.computersprofessor.com/2016/05/what-is-domain-name-system-dns.html
As the Internet became larger, the Domain Name System (DNS) was developed,
to allow the network expand more easily by assigning names to host computers in
a distributed fashion.
The big seven generic top level
domain names in the United States are com,
edu, gov, int, mil, net
and org. In addition, every country
his its own top-level domain name. In the United States, these are called
country codes. It is easy to track down a listing of all country codes online.
The number of top level domains
names is an artifact of the early years of the Internet. In total, including
all country codes there are about 150 top level domain names.
It is important to realize that DNS
is a distributed naming scheme that follows the boundaries of countries and
organizations, rather than those of networks. The DNS represents a key feature
of the success of the Internet distributed assignment and record keeping of a
database, so that a local authority is responsible for local information. This
means that the administrators do not face the impossible task of trying to
maintain one enormous central database that would be choke point and would
strangle Internet use.
The following are generic top-level
domains names.
Domain
Name Meaning
com Commercial Business
edu Education
gov Government
int International Entity
mil Military
net Networking Organization
org Non
Profit Organization