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The internet is a big place, and every site needs a way for visitors to find them. The domain of a website acts as the virtual address that directs visitors from around the globe to your website.
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 part of the domain before, this ending is called the domain extension, or top-level domain. It's the most important factor in determining a domain's unique identity.