An SEO glossary of terms every marketer should know in 2026
A practical, current glossary covering the essential SEO terminology every marketer should be comfortable with, from foundational concepts to 2026-specific terms.
6 min read
The subdomain versus subdirectory debate has run for years in SEO circles, with genuine evidence and Google statements evolving over time. The current, reasonably settled understanding leans toward subdirectories as the generally safer, simpler default, though the gap has narrowed considerably from earlier years.
The historical concern with subdomains
Historically, some evidence suggested Google occasionally evaluated a subdomain's authority somewhat separately from the main domain, meaning a new subdomain could take longer to build the ranking strength the main domain already had — this was a genuine, if debated, practical concern.
Google's more recent statements
Google representatives have increasingly stated that subdomains and subdirectories are treated similarly in most cases, with Google's systems generally capable of understanding both as part of the same overall site — reducing, though perhaps not entirely eliminating, the historical concern.
The debate has softened considerably, but 'similar in most cases' is not quite the same guarantee as 'identical in every case' — the subdirectory default remains the lower-risk choice when there is no strong reason otherwise.
When a subdirectory is the clearly better choice
- A new content section, blog, or resource area closely tied to your main site's purpose.
- Any situation where consolidating authority under one clear domain matters most.
- Simpler technical management, avoiding the need for separate hosting or certificate configuration.
When a subdomain still makes sense
A genuinely distinct product or service requiring separate technical infrastructure, a different team managing it entirely independently, or specific security or compliance requirements isolating it technically, can justify a subdomain despite the modest theoretical SEO tradeoff.
Frequently asked questions
Should I move an existing subdomain to a subdirectory for SEO reasons?
This carries real migration risk and effort — only consider it if you have specific, strong evidence the subdomain structure is genuinely underperforming, not purely on the theoretical debate alone.
Does this debate apply equally to blog sections specifically?
Yes, a company blog is a very common case where the subdirectory versus subdomain question arises, and the subdirectory default generally applies here as strongly as anywhere.
Is there a definitive, universal answer to this debate?
Not entirely, since specific situations and evidence vary — but for most typical business use cases, the subdirectory default represents the lower-risk, generally recommended choice today.
If you are deciding how to structure a new site section, talk to our team.
The takeaway
Default to a subdirectory for a new site section unless you have a specific technical or organisational reason for a subdomain — this consolidates authority most reliably and simply.
Written by Fibvo — Bengaluru and Erode, India — working with clients in other time zones. Questions, or think we have it wrong? Tell us.
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