Subdomain
In one line
A subdomain is a separately addressed prefix in front of your root domain (blog.example.com) — and the long-running counterpart in the 'subdomain vs subfolder' SEO debate.
Going deeper
A subdomain is a labelled prefix in front of the root domain — 'blog.example.com'. Whether to put new sections on a subdomain or a subfolder ('example.com/blog') is one of the longest-running SEO debates.
Google's stated position is that it handles both and you should choose based on site structure and operational fit. In practice, authority tends to compound faster on subfolders, which is why most teams default to subfolders for early-stage content sections.
Subdomains earn their place when there is a real reason for separation — a different stack for help centres or developer docs, distinct legal entities, or hosting and infrastructure constraints. Read the choice as a trade-off between SEO signal compounding and operational separation.
Related terms
URL Structure
URL structure is the deliberate hierarchy and pattern of your URLs — from domain through directories to slug — designed so both users and search engines can read where a page sits in your site.
SEOURL Slug
A URL slug is the trailing path segment of a page URL — a short, lowercase identifier that signals what the page is about both to readers and to search engines.
SEOTechnical SEO
Technical SEO is the infrastructure-level work — crawling, indexing, rendering, speed, structured data — that makes a site readable and rankable for search engines in the first place.
SEOOn-Page SEO
On-page SEO is the work you do inside a page itself — title, headings, body copy, internal links — to align it with search intent and make ranking signals legible to engines.
SEOGooglebot
Googlebot is Google's official web crawler used to build the search index — controllable through robots.txt rules and identifiable by its User-Agent string.
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