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
A multilingual site introduces SEO complexity beyond a single-language site: URL structure decisions, hreflang implementation, and translation quality all directly affect whether each language version can genuinely rank in its target market.
URL structure options
- ccTLD (example.fr): strongest geo-targeting signal, but requires managing multiple domains.
- Subdomain (fr.example.com): moderate geo-targeting signal, single core domain to manage.
- Subdirectory (example.com/fr/): easiest to manage and consolidates domain authority, Google's generally recommended default for most businesses.
Hreflang, done correctly
Every language version needs reciprocal hreflang tags pointing to every other version, including a self-referencing tag — our hreflang guide covers the specific implementation and the most common errors in depth.
The URL structure decision matters less than most site owners assume — consistent execution of whichever structure you choose matters far more.
Translation quality: the mistake that recurs most
Machine-translated content published without human editing and localisation review frequently reads awkwardly to native speakers and can fall under increasing scrutiny from quality systems designed to detect low-value, mass-produced content — see our scaled content abuse explainer.
- Use professional human translation and localisation, not raw machine translation, for content you want to genuinely rank.
- Localise beyond literal translation — currency, units, cultural references and examples should fit the target market.
- Avoid publishing the same content translated into dozens of languages simultaneously without genuine market demand or editorial oversight for each.
Keyword research per market, not just per language
The same product can be searched for using genuinely different terms across markets sharing a language — UK and US English search behaviour differs meaningfully in places, and keyword research should be done per target market, not assumed identical across a shared language.
Frequently asked questions
Which URL structure does Google actually prefer?
Google has said it does not have a strong preference among ccTLD, subdomain and subdirectory approaches, provided implementation is clean and consistent — the choice should be based on your own management and business considerations.
Is machine translation ever acceptable?
It can serve as a starting draft, but published content intended to genuinely rank should go through human review and localisation, not remain as raw, unedited machine output.
Do I need a completely separate keyword strategy for every market?
Generally yes for genuinely different languages, and often for regional variations within the same language too, since search behaviour and terminology can differ meaningfully even between markets sharing a language.
If you are planning or troubleshooting a multilingual SEO structure, contact our team.
The takeaway
Use professional translation, not machine translation alone, for any page you genuinely want to rank — Google's quality systems increasingly recognise low-quality, unedited machine-translated content.
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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