What Are TLDs gTLDs ccTLD SLD And IDNs

When we come into domain name industry then often we listen the terms TLDs, gTLDs, ccTLDs, SLDs and IDNs. These are basic terms we use in the domain name industry. A domain name length can 253 ASCII
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Terms Stand For

TLDs Top Level Domains
SLDs Second Level Domains
gTLDs Generic Top Level Domains
ccTLDs Country Code Top Level Domains

IDNs Internationalized Domain Names

TLDs Top Level Domains

TLD is called the Top Level Domain. Whenever we write a URL (Uniform Resorse Locater) then write the domain name also in it have examples,
http://www.GoForTricks.com
http://www.STBHD.com
http://www.HeterochromiaIridum.com
In above examples of URLs the last term is known as TLDs i.e. .com
In 1980 the Domain Name system was devised and TLDs were divided into
(1) gTLDs
(2) ccTLDs
(1) gTLDs
gTLDs are called the Generic Domain Names. These generic domain names are specified as
.COM .EDU .INT
.NET .GOV
.ORG .MIL
Example of some New gTLDs


(2) ccTLDs
ccTLDs are know as Country Code Top Level Domains
In 1985 there were 3 ccTLDs
.us
.uk
.co
Then after in 1986 eight new ccTLDs were launched
.au .fr .nl
.de .jp .se
.fi .kr

SLD Second Level Domains

These are second level domains which comes after the Top Level Domains have some example
http://www.GoForTricks.com
http://www.STBHD.com
http://www.HeterochromiaIridum.com

As we can see above the letter which are bold is called the domain names which we normally register from registrar.
Third Level Domains Or Sub Domains

http://www.GoForTricks.com
http://mail.STBHD.com
http://blog.HeterochromiaIridum.com
As you can see in above URLs the letter in the Bold are know as the Third Level Domains. These third level domains are also known as the Sub domains.
Sub domains specify the different section of the website.
if something is there before the Third Level Doamins is known as Fourth level domains and so on. like
http://my.blog.HeterochromiaIridum.com
The word my is known as the Fourth Level Domain.
IDNs Internationalized Domain Names

Intitially the domain name were in ASCII. But later on the ICANN ( Internet Corporation for Assigned Names and Numbers) decided to launch the IDNs.
Then meaning of IDNs is to launch the domain name in other languages like Hindi,Korean and Chinese like,Now a days there is very hard to get the generic .com domain name and if it is available then it is very expensive so IDNs made this thing easy. Some of new gTLDs also have IDNs.

This was all about the TLDs gTLDs SLDs And IDNs.