Domains and DNS - An Introduction

Welcome to the Internet! Both Domains and DNS are key functions in the world of the web, so it is best to have at least a beginner’s understanding of what they do, and how they function, especially if you want to dive deeper into the world of websites!


Although you may not know the word “Domain”, you definitely know what it means! A domain is simply the homepage of a website, whether that be, or Domains have multiple levels, so let’s take a closer look.

1.The TLD - Or Top Level Domain is the very end of a domain name. The TLD is simple: its what comes after the last dot! This could be “.com” “.net” “.org”, or even some more exotic ones like “.tattoo”. In September of 2021, there were 1,591 TLDs! You can check out the full (And extensive) list of TLDs at

2.The Second Level domain comes right before the Top Level Domain, so in “”, it would be “google”

3.The sub-domain, and anything that comes before the Second Level Domain. For example, in “”, “docs” would be a sub-domain.

4.For each domain that comes after the Second Level Domain, a “sub” is added to its name. For example, in “”, “this” is a sub-sub-domain.

Here is a simple review: - “com” is the TLD - “awesome” is the Second-Level Domain - “is” is a sub-domain - “This” is a sub-sub-domain

If you see something like, “This” would be a sub-sub-sub-sub-domain.


Domain Name Registrar

Domain name registrars are companies that sell domain names. If you are looking to buy a domain, make sure you find a registrar that is ICANN certified. ICANN certified registrars are certified by the company in charge of domain names (ICANN), so you can be sure that the company will follow all the rules. Popular domain registrars include NameSilo and NameCheap.


Nameservers are an important part of every website. Their job is to take the domain name of a website (like and turn it into an IP address that your computer can recognize (Like You can learn more about them in our nameserver article.


How does DNS work?

DNS is fairly complicated, but it is basically a collection of servers (Called DNS servers) that make sure information gets where it needs to be. You can learn more about how DNS works, and what is does, in our DNS propagation article. DNS records are text records placed on the server that tell browsers what to do. There are many different types, with the most popular listed here.


Domains and DNS are important in every website, and hopefully, this article allows you to gain a basic understanding of this topic. We know that this article may just seem like a collection of links, so we invite you to check out the topic listing, where you can find all of our articles on this topic. Choose the ones that sound the most interesting!


Article by Tinkerman