TECHNICAL · SEO GLOSSARY
SEO Audit
A systematic review of a website's technical health, on-page optimisation, link structure, and AI visibility — producing a prioritised list of issues and fixes.
Definition
An SEO audit is a comprehensive evaluation of all the factors that affect a website's ability to rank in search engines and be cited by AI answer engines. A complete SEO audit covers: technical factors (crawlability, indexability, HTTPS, site speed, structured data, sitemaps), on-page factors (title tags, meta descriptions, heading structure, content depth, internal linking), off-page factors (backlink profile, referring domain quality), performance (Core Web Vitals — LCP, INP, CLS — from real field data), and AI visibility (llms.txt, AI crawler access, FAQPage schema, answer-friendly content structure). The output is a prioritised list of issues by severity (critical/warning/info) and category, with specific fix instructions.
Why it matters for SEO
An SEO audit identifies the gap between where a site is and where it could be. Many sites have critical issues that have existed for months or years — missing canonical tags, broken internal links, pages blocked from crawling that should be indexed, LCP images missing preload hints, or structured data with validation errors — that a systematic audit surfaces in minutes. For sites targeting AI answer engines (ChatGPT, Perplexity, Claude, Google AI Overviews), an AI visibility audit is now a distinct required layer: traditional SEO tools don't check llms.txt, AI bot access policies, or content structure for LLM retrieval. A [free SEO audit at DeepSEOAnalysis](/) covers all six pillars — technical, onpage, performance, structured data, links, and AI visibility — with no signup and no email gate.
How DeepSEOAnalysis checks this
DeepSEOAnalysis crawls up to 50 pages (free) or 1,000 pages (paid), runs 80+ checks across six weighted categories, and produces a scored report (0–100) with every issue ranked by severity and impact. The audit uses real CrUX field data for Core Web Vitals rather than synthetic lab simulations. The GEO/AI visibility score is computed separately across five signals. Results are shareable via a public URL.
Useful tools and resources
GLOSSARY
Related terms
technical
Crawlability
Whether search engine crawlers can successfully access, fetch, and parse a page — the prerequisite for indexing and ranking.
Read definition →technical
Index Coverage
The count and status of pages Google has discovered, crawled, and indexed from a site — tracked in Google Search Console.
Read definition →performance
Core Web Vitals
Three Google metrics — LCP, INP, and CLS — that measure real-user loading, interactivity, and visual stability.
Read definition →structured data
Structured Data
Machine-readable annotations added to HTML — usually JSON-LD — that explicitly describe what a page is about to search engines and AI systems.
Read definition →links
Internal Linking
Links between pages on the same domain that distribute PageRank, establish site hierarchy, and guide crawlers to important content.
Read definition →See how your site scores on SEO Audit.
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