A domain extension is the suffix at the end of a web address, such as .com or .net. For example, in the domain name www.learn2yoga.com, .com is the extension.
When you choose your domain name, you can select from the extensions .com, .net., .org, .biz, and .info (if you're doing business in the United States, you can also use .us).
If you're having trouble finding the right web address, consider using a different extension. You'll get more choices, plus some extensions can reflect your type of business or service.