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Foundations · 7 min read

The SEO glossary: 40 terms explained simply

From 'alt text' to 'zero-click search' — plain-English definitions.

A–F

  • Alt text — a description of an image for screen readers and search engines.
  • Anchor text — the clickable words of a link.
  • Backlink — a link from another site to yours.
  • Canonical — the preferred version of a duplicated page.
  • Citation — a mention of your business name, address and phone.
  • Core Web Vitals — Google's page experience metrics.
  • Crawl budget — how many pages a search engine will crawl on your site.
  • E-E-A-T — Experience, Expertise, Authoritativeness, Trust.
  • Featured snippet — an answer box at the top of results.

G–N

  • GEO — Generative Engine Optimisation for AI answers.
  • Google Business Profile — your listing in Maps.
  • Hreflang — tags for language and region targeting.
  • Indexing — storing a page so it can appear in results.
  • Internal link — a link between pages of your own site.
  • Keyword cannibalisation — your own pages competing.
  • Keyword difficulty — how hard it is to rank.
  • Local pack — the three map results.
  • Long-tail keyword — a longer, more specific search.
  • Meta description — the summary shown under a result.
  • Noindex — an instruction not to index a page.

O–Z

  • Organic traffic — unpaid visitors from search.
  • PPC — pay-per-click advertising.
  • Redirect (301) — a permanent move of a page.
  • Rich result — an enhanced listing with stars, prices etc.
  • Robots.txt — a file giving crawlers instructions.
  • Schema — structured data vocabulary.
  • Search intent — what the searcher wants.
  • SERP — search engine results page.
  • Sitemap — a list of your pages for search engines.
  • Title tag — the headline of a search result.
  • Topic cluster — a pillar page with linked articles.
  • Zero-click search — a search answered without a click.
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