Top level domains (TLD) are essentially the extension, or end part, of your website. The purpose of top level domains is to help users find your website.
Examples of top level domains include:
Based on what entity the website is for, the top level domain can differ.
For example, generic websites have TLDs like “.com”. However, sponsored TLDs can be “.edu” or “.gov” because they represent accredited institutions.
Below is a graphic from Marketing91 that shows the architecture of a url. As you can see, the top level domain is “.com”.