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A domain is a very important part of blogging. why it's important to blogging? let's see an example to understand it better.think  your friend wants to visit your house .but friend doesn't know where your house is situated. Then you can send your address to the friend then he /she can easily find your house.so domain work like address it helps to find your website for others.


there are several parts in domain,

1) top-level domain
2) Subdomain
3) Country Code Top Level Domains
4) Generic Top-Level Domain
5) Second-Level Domains
6)  Subdomains



top-level domain(TLD)



A top-level domain is exactly what it sounds like: a type of domain name which is at the top level of the internet’s domain name system. There are over a thousand TLDs available but the most common include .com, .org, .net and .edu.

The official list of TLDs is maintained by an organization called the Internet Assigned Numbers Authority (IANA) and can be viewed here. IANA notes that the list of TLDs also includes ccTLDs and gTLDs, which we’ll talk about next.


Country Code Top Level Domains(ccTLD)




ccTLDs use just two letters and are based upon international country codes, such as .us for the United States and .jp for Japan. They’re often used by companies which are building dedicated sites for specific regions and can be a good way of signaling to users that they’ve arrived at the right place.


Generic Top-Level Domain (gTLD)



A gTLD is essentially a TLD that doesn’t rely on country code. Many gTLDs are intended for a specific use-case, such as .edu which is aimed at educational institutions. That said, you don’t have to meet any specific criteria to register a gTLD, which is why.com isn’t only used for commercial purposes.

Other examples of gTLDs include .mil (military), .gov (government), .org (for non-profits and organizations) and .net, which was originally designed for internet service providers (ISPs) but which is now used much more widely.



Second-Level Domains


You’ve probably seen these domain names before. We’re talking about a domain that sits directly below a top-level domain name. , particularly when it comes to country codes.

For example, British companies occasionally use .co.uk instead of .com, and it’s a perfect example of a second-level domain. Another second-level domain is .gov.uk, which is often used by governmental institutions, and .ac.uk, which is used by academic institutions and universities.



Subdomains



Subdomains are useful because they don’t require webmasters to purchase an additional domain name to create divisions within their site. Instead, they’re able to create a subdomain which effectively points to a specific directory on the server. This can be super useful for campaign sites and other types of web content that should be kept separate from the main site.

For example, google  blogger use "yourSite.Blogspot.com" Sub Domains For there blogger clients