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The Domain Name System is the hierarchical naming system used to identify any machine connected to the Internet or a private network. It takes text-based domain names (such as and translates them into the computer's numerical address. See Wikipedia for more details.

domain name

The text version of a website's address, such as "" or "". The rightmost part of the domain name after the last dot (.com, .org, .biz, etc.) is known as the top-level domain (TLD). Left of the TLD is the second-level domain (SLD), and anything left of the SLD is a subdomain.

For example, in, ca is the TLD, gc is the SLD, and canada and www are both subdomains.