AI SEO を無料で入手してください。


What is a Subdomain?

A subdomain is a prefix that appears before the main domain in a URL. For example,、 と are subdomains of

Businesses and bloggers typically use subdomains to host content they do not want or cannot host on their main domain. This content is usually in a different format or intended for a separate audience from the one on the main domain. However, the business or blogger wants their visitors to know they own the site hosted on the subdomain. 

For example, a computer manufacturer with a site at may host its support service at That way, the subdomain gives the support site enough credibility while preventing the brand from including unrelated user-generated content on its main site. 

🇯🇵 日本語