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The web is a vast place, and every site requires a means for users to get them. Domains are its virtual address, leading people from all over the world to visit your site.
But just like an address, not all domains will be exactly alike. In addition to having different wording, but they also have a unique ending.
Although you might have missed this aspect of the domain the end, it's known as the extension domain or top-level domain, and it's crucial in what determines a domain's identification.