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A subdomain is an addition that comes before the actual domain name and is separated by a dot, for example, A subdomain is also known as a third-level domain. For more information on the structure of domains, see this article.

A subdomain is a separate area from your main website where you can run a separate website. However, since the name of the domain is included, it remains clear that the websites belong to the same person, the same company, or the same project.

The question of whether to set up a subdomain usually arises when a website is to be expanded by additional areas. This requires a thorough analysis of which is more appropriate – a separate website on a subdomain (e.g. or a subdirectory in the existing website (e.g. The decision has a significant impact on website maintenance, SEO ratings and more.

For example, subdomains are often used for the following purposes:

  • Languages: separate websites for different language regions or countries, e.g.
  • Locations: separate websites for different locations of a company, e.g.
  • Stores: a separate website for a company’s online store, e.g.
  • Job advertisements: a separate website for a company’s job advertisements, e.g.

You can find out how to create a subdomain in this article.

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