The first thing you need to know is that content for the web has three main parts: how to access it, how it’s displayed, and how it’s found.
Accessing content on the web demands an URL. And this has up to five components. Imagine a simple website, such as www.google.com.
The “google” is the actual domain, while the “.com” is called the top-level domain. When buying your domain, you have to select both, because you can have google.com.br, google.fr, google.net, and so on.
There are certain top-level domains restricted to certain industries and organizations to facilitate recognition and trust by the general public, such as .gov or .edu.