What is domain extension?

[Patrick_Kane]

Domain extensions (or Top Level Domains/TLDs) are the suffixes or the last part of any website domain name - these letters are types after the dot to the right of any domain name.It helps to make the difference between creating a successful Web presence and getting lost in cyberspace. It also boosts your small business credibility.

[SKS]

Domain Extension is the notation used at the end of the domain name after the (.) sign. For example, digitalbaharat.co.in is your website domain so the .co.in is the domain extension here.
Other popular domain extensions are as follows
.com
.net
.org
.co.in
.in
.co.uk
.uae

[Austinmiller]

When it comes to registering domain names you'll generally be given quite a few options in regards to the domain name extensions. This refers to whether you register a .COM, .NET, .ORG. US, etc.