Yes, you can have as many as you like, depending on what's available from a particular provider.
Perhaps you have more than one website, perhaps you want to buy the .com and .net as well as the .co.uk to stop others passing off as you.
The costs vary depending on the provider and may vary depending on whether or not you wish to purchase multiple domain names. Some providers offer bundles if you multi-buy. Check out the various domain registrars out there for the best deals.
Once you have purchased your domains, and if you would like to direct them all to your new website, you'll need to drop the different domain names into your workshop and into the Domains page.
Please see the following article for details on how to do this.
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