What Is Subdomain?
A subdomain is a domain that is part of a larger domain, created by adding a prefix before the main domain name. For example, blog.nicename.me, docs.stripe.com, and mail.google.com are all subdomains. They function as separate websites or services while remaining under the parent domain's umbrella.
Subdomains are commonly used for: blogs (blog.example.com), documentation (docs.example.com), applications (app.example.com), support portals (help.example.com), staging environments (staging.example.com), and API endpoints (api.example.com).
From an SEO perspective, subdomains are treated somewhat separately from the main domain by search engines — a subdomain doesn't automatically inherit the parent domain's full authority. For content that should benefit from your main domain's SEO authority, subdirectories (example.com/blog) are generally preferred over subdomains (blog.example.com).
Why This Matters for Startups
Use subdomains for functionally separate services: your app (app.yourbrand.com), documentation (docs.yourbrand.com), or API (api.yourbrand.com). For content like blogs that should boost your main domain's SEO, use subdirectories (yourbrand.com/blog) instead of subdomains. Setting up subdomains is done through DNS — typically by adding a CNAME or A record for the subdomain pointing to the appropriate server.
Ready to Find Your Startup's Domain?
Browse our curated collection of premium domains or get a free appraisal on any name.
Browse Premium Domains