Quick summary
- Term
- Subdomain
- Plain-English definition
- A subdomain is a prefix added before a root domain, such as `blog.example.com`.
- Technical definition
- A subdomain is a prefix added before a root domain, such as `blog.example.com`.
- Commonly confused with
- Related domain, DNS, registrar, API, or agent-infrastructure terms.
- Related terms
- Hostname, Root Domain, DNS Record
Definition
A subdomain is a prefix added before a root domain, such as `blog.example.com`.
Why it matters
Subdomains let domain owners separate websites, apps, environments, and services.