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The internet is a big area, so every website requires a means for users to find them. A site's domain acts as the virtual address that directs visitors from around the world to visit your site.
Like an address, not all domains are exactly the same. They not only have various words, they also come with a distinct end.
You may not have noticed this part of the domain it was known as the extension of a domain, also known as top-level domain, and it's the most important factor in determining a domain's unique identity.