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The Internet is a huge area, so every website must provide a way for users to find them. Domains represent the address of your site to the web, which directs people from all over the world to your site.
But just like an address, none of the domains exactly alike. Not only do they have distinct words, they will also have a distinct start.
You may have not noticed this aspect of the domain in the past, it was commonly referred to as a domain extension also known as the top-level domain. It's the most important factor in what determines a domain's character.
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