The AI SEO Periodic Table: 55 Terms, Explained Simply

AI search arrived with a whole new vocabulary, and most of it is jargon standing in front of a simple idea. Here is the entire vocabulary in one place, grouped into eight families and explained in one plain line each. Tap any term to see what it means.

You do not need to memorise this. You need to recognise it, so that the next time an agency or a LinkedIn post throws AEO, GEO, LLMO and RAG at you in one breath, you can tell the substance from the alphabet soup. That is the whole point of the table.

Why this exists

For twenty years, being found meant one thing: rank on Google. That has split into three overlapping jobs. Rank in traditional search. Be the answer an engine reads out. Be the source an AI decides to cite. Each job brought its own acronyms, and the noise now hides how simple the underlying shift really is.

The gap that is widening fastest is not between good and bad marketing. It is between the brands an AI can find and describe, and the ones it cannot see at all.

If you want the strategy behind these terms rather than the definitions, our AI SEO guide covers how the pieces fit together, and the modern marketing breakdown shows where AI search sits in the wider picture.

The full glossary

Every term above, in text, grouped by family. This is also the version an AI assistant reads.

AI Search & Visibility

AIO · AI Overviews: Google's AI-written answer box at the top of results, assembled from several sources at once.
ZCR · Zero-Click Result: A search answered on the results page itself, so the person never visits a website.
AIV · AI Visibility: Whether, and how often, your brand shows up inside AI-generated answers.
CIT · Citation: A named reference to your site inside an AI answer. The AI-era version of a ranking.
AIS · AI Snippet: A short extract of your content that an AI engine lifts to build part of its answer.
MEN · Mention: Your brand named in an AI answer or across the web, with or without a link.
ASO · App Store Optimisation: Improving an app's visibility and install rate inside the App Store and Play Store.
CGP · Citation Gap: Queries where competitors get cited by AI and you do not. Your clearest to-do list.

Traditional SEO

SEO · Search Engine Optimisation: Earning visibility in search results without paying for the placement.
CTR · Click Through Rate: The share of people who see your listing and actually click it.
CMS · Content Management System: The software your site runs on, such as WordPress, that stores and publishes content.
RSS · Really Simple Syndication: A feed format that lets tools and readers subscribe to your new content automatically.
SERP · Search Engine Results Page: The page of results a search engine returns for a query.
AMP · Accelerated Mobile Pages: A stripped-down page format Google once pushed for fast mobile loading, now largely retired.
URL · Uniform Resource Locator: The web address of a page.
XML · Extensible Markup Language: The format behind sitemaps and data feeds that search engines read.
PPC · Pay Per Click: Paid search advertising where you are charged each time someone clicks your ad.

Content & Optimisation

AEO · Answer Engine Optimisation: Structuring content so answer engines can lift a clean, direct answer straight from it.
EEAT · Experience, Expertise, Authoritativeness, Trust: Google's framework for judging whether content deserves to be trusted.
NLP · Natural Language Processing: How machines parse and make sense of the human language in your content.
LSI · Latent Semantic Indexing: Related terms that signal a topic is covered in depth, not just by one keyword.
GEO · Generative Engine Optimisation: Optimising to be surfaced and cited inside generative AI answers.
CRO · Conversion Rate Optimisation: Improving the share of visitors who take the action you want.
ENT · Entity Recognition: How search and AI systems identify the people, places and brands your content is about.
BLUF · Bottom Line Up Front: Leading with the answer first, which both readers and AI engines reward.
TPC · Topic Cluster: A pillar page plus supporting articles that together signal real depth on a subject.

Technical SEO

SSR · Server-Side Rendering: Sending fully-formed HTML from the server so crawlers can read content without running JavaScript.
API · Application Programming Interface: A structured way for one system to request and exchange data with another.
SCH · Schema Markup: Structured-data code that tells search and AI engines exactly what each part of a page means.
LLMs · llms.txt: A proposed file that tells AI crawlers which content on your site they may use.

AI Models & Infrastructure

LLMO · Large Language Model Optimisation: Shaping your content and signals so large language models represent you accurately.
RAG · Retrieval-Augmented Generation: When an AI fetches live sources before answering. This is how citations actually happen.
VEC · Vector Embeddings: Numerical representations of meaning that let AI match your content to a question.
CHK · Chunking: Splitting content into self-contained passages an AI can retrieve and quote cleanly.
GRD · Search Grounding: Tying an AI's answer to real retrieved sources instead of memory alone.
HAL · Hallucination: When an AI states something false with full confidence. The core risk of unsupervised AI.
KGR · Knowledge Graph: A structured map of entities and how they relate, which search and AI both draw on.
RES · Response: The answer an AI returns to a prompt.
NDT · Non-determinism: The reason two identical AI queries can return two different answers.

Metrics & Analytics

GA · Google Analytics: Google's tool for measuring site traffic and visitor behaviour.
GSC · Google Search Console: Google's tool showing what you rank for, plus impressions, clicks and indexation.
KPI · Key Performance Indicator: The specific number a piece of work is judged against.
ROI · Return on Investment: What you get back relative to what you spent.
IGN · Information Gain: How much genuinely new information your page adds beyond what already ranks.
SOM · Share of Model: How often an AI names your brand versus competitors across a set of prompts.
CMT · CiteMET Framework: An emerging way to measure and track AI citations over time.

Brand & Reputation

ORM · Online Reputation Management: Actively shaping what people and AI find when they look you up.
SEN · Sentiment Analysis: Reading whether mentions of your brand are positive, negative or neutral.
SMO · Social Media Optimisation: Making your social profiles and posts work as discovery and trust signals.
SOV · Share of Voice: Your slice of the total conversation in your category.

Emerging AI Concepts

FOQ · Fan-out Queries: The many sub-questions an AI quietly asks itself to answer one prompt.
SEM · Semantic Search: Search that matches meaning and intent, not just the exact keywords typed.
PRO · Prompt: The instruction a user gives an AI. Increasingly, this is the new search query.
MEM · Memories: What an AI assistant remembers about a user across sessions.
AGS · Agentic Search: AI agents that browse, compare and act across sites on a person's behalf.

Knowing the words is step one. Knowing where you stand is step two. Run your site through our free AI readiness checker and see what an AI assistant can actually fetch, read and cite about you right now.

Check your AI readiness → or run the full master SEO tool →

Common questions

What is the difference between AEO and GEO?

Answer Engine Optimisation (AEO) is about structuring content so an engine can lift a clean, direct answer from it. Generative Engine Optimisation (GEO) is the broader effort to be surfaced and cited inside generative AI answers. They overlap heavily, and in practice most good work serves both at once.

Is AI SEO replacing traditional SEO?

No, it is layering on top of it. Google still handles the overwhelming majority of searches, and the technical foundations, clean HTML, schema, crawlability, are exactly what AI engines need too. The businesses that win treat it as one discipline, not two competing ones.

Do I need to know all 55 of these terms?

No. You need to recognise them so you are not sold jargon as if it were strategy. The handful that matter most for getting cited by AI are citation, retrieval-augmented generation, schema markup, server-side rendering and entity recognition. The rest is useful context.

How do I know if AI can even read my site?

Run it through our free AI readiness checker. It fetches your page the way an AI crawler would and reports whether your content is visible in the raw HTML, whether your schema is clean, and whether anything is blocking the AI crawlers at the server level.

Keep reading

AI SEO, explained Modern marketing in 2026 Free AI readiness checker Free master SEO tool SEO services

The idea of laying out AI SEO vocabulary as a periodic table has been going around, credited to Anna York of Citation School. We liked it enough to build our own interactive version from scratch, with our own definitions and categories. The framing is hers, the words here are ours.