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A plain-English encyclopedia of search
Look up a term, get the answer in the first sentence, leave. Written and maintained by Elin Marsh.
Browse by section
- How Search Works Crawling, indexing, ranking and the result page itself — what actually happens between publishing a URL and someone seeing it. 96
- Keywords & Search Demand Finding out what people actually type, how much of it there is, and whether you can realistically compete for it. 110
- Content & On-Page What goes on the page and how it is put together: titles, headings, copy, formats, media and the links between your own pages. 106
- Technical SEO The plumbing: what makes a site cheap for a crawler to read, fast for a person to load, and safe to change without losing rankings. 143
- Links & Authority How links are earned, measured and misused — and which of the third-party authority scores mean anything. 80
- Tools & Measurement Neutral entries for the software SEOs actually open, and for the numbers those tools report. 355
- SEO in Practice Search outside the textbook: local businesses, online stores, specific industries, and how the work is organised, priced and hired. 325
Most looked up
Full A–Z index- 1SEO
- 2Google Search
- 3SEO News
- 4SEO Marketing
- 5SERP
- 6AI SEO
- 7SEO Blog
- 8Keyword Research
- 9Keyword
- 10What Is a Landing Page
- 11SEO Strategy
- 12Sitemap
- 13Robots.txt
- 14Technical SEO
- 15Backlinks
- 16Domain Authority Checker
- 17Google Trends
- 18SEO Tools
- 19Google Analytics
- 20Semrush
- 21Ahrefs
- 22Similarweb
- 23Erank
- 24Ubersuggest
Why this exists. Looking up a definition should not cost nine paragraphs and a demo booking form. Every entry here answers in the first sentence, names its sources, and shows the day it was last read end to end. About the project · How entries are written · Sources & corrections