What is a Subdomain?
A subdomain is a prefix added to your main domain name that creates a separate web address. For example, blog.example.com and shop.example.com are subdomains of example.com, each capable of hosting independent content or applications.
How Does Subdomain Work?
Subdomains are created through DNS configuration by adding an A record or CNAME record for the subdomain prefix. They function as independent websites that share the main domain — you can point them to different servers, applications, or even different hosting providers. Common uses include blog.example.com, app.example.com, and staging.example.com.
From an SEO perspective, subdomains are treated as separate entities by search engines, meaning link authority does not automatically transfer between a subdomain and the main domain. This is why many sites prefer subdirectories (example.com/blog) over subdomains for content that supports the main site. However, subdomains are ideal for functionally distinct applications.
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