Domain names can be purchased at any accredited domain registrar. A domain registrar is a company whose main purpose is to register domain names for people.
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Most hosting providers can also obtain a domain name for you, but domains can be more expensive this way, due to the added overhead.
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There are several very popular domain registrars, including GoDaddy.com, Enom.com, and Dotster.com (shown here). Most of their prices should be about the same.
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All three of these sites do, of course, have a way for you to check if a domain name is available for purchase. Let's take a look at GoDaddy.com.
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We can enter a domain here, right on the home page

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As we can see, the domain we entered isn't available. Note the list of suggestions below

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This is the end of the tutorial. You should now know where to buy a domain name