Domain Names - Websites for Humans

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In oversimplified terms, a domain name is a character string that identifies an Internet resource. Most people think of something-DOT-something as a website, an ISP, or an email address, which is reasonably correct.

In technical terms, a domain name consists of one or more labels delimited by periods (or dots), such as The rightmost label is the top-level domain. For example, the com in is the top-level domain. There are many top-level domains other than com. Each label to the left of a dot is a subdomain of the domain to the right. In other words, is a subdomain of com and is a subdomain of

A hostname is a domain name that has at least one associated IP address. For example, the domain names and can ber hostnames but the top-level com domain cannot. Other top-level domains, however, particularly country code top-level domains, can have an IP address, and if so, they are also hostnames.

Having a domain name is a very important part of your online presence if you're a business or organization but any person or group can have a domain name. It's very easy to register a domain name that isn't already in use. The cost is whatever a particular domain name registrar determines it to be.

You can use a domain name as your email address. Go to the next tab for more information.
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