Glossary entry
SEO — Search Engine Optimization
Definition
SEO (Search Engine Optimization) is the practice of improving a website's organic visibility on search engines like Google and Bing. It covers technical health, on-page content, page experience signals, and off-site authority (backlinks, brand mentions, citations).
How it works
The mechanism.
Search engines crawl your site, index its pages, and rank them for relevant queries based on 200+ signals. SEO work targets these signals: site speed + mobile-friendliness (Core Web Vitals), structured data (schema.org), content that matches buyer intent, internal linking, and external trust signals (links from other sites). Done well, SEO compounds — pages keep ranking and generating traffic long after the work is shipped.
Why it matters
Why this matters in 2026.
Organic search remains the largest source of qualified, high-intent traffic for most businesses. Unlike paid ads, SEO doesn't stop earning when you stop paying — well-built SEO compounds for 12-24 months even after the engagement ends.
How to check
How to test for it.
Three quick checks: (1) Search 'site:yourdomain.com' on Google — confirms indexation count. (2) Run pagespeed.web.dev — green Core Web Vitals on mobile. (3) Run the free HEO Checker — full 32-factor audit including SEO foundation.
Adsomia services
Where this fits in our work.
Common questions
About SEO.
How long does SEO take to work?
First measurable rankings improvements: 4-8 weeks. Material traffic lift: 4-6 months. Dominant rankings for competitive terms: 12-24 months. Anyone promising faster is using risky tactics.
Is SEO still worth it in 2026?
Yes — but on its own it's incomplete. Google still drives 60%+ of search-style queries, so SEO remains valuable. But AI engines (ChatGPT, Perplexity, Gemini, Claude) now drive 40%+ — which is why we extend SEO into HEO.
Can I do SEO myself?
You can do the basics: title tags, content, schema markup, GBP. Beyond that — technical audits, link earning, content production at scale — usually requires either a dedicated in-house team or an agency.
What's the difference between SEO and HEO?
SEO covers one channel (Google search). HEO covers Google + AI engines + answer engines as one workflow. HEO includes SEO.
Related terms
Read next.
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