—— § Glossary

Words we
use a lot.

A working glossary for Generative Engine Optimization. Each entry is plain-language with enough technical detail to be useful, and cross-linked to the related terms.

A

AI Score
AIRRNK's 0–100 grade for how likely a site is to be cited by a language model, calculated from 47 weighted checks across four pillars.
Answer Capsule
A self-contained paragraph-level span of text that answers a specific question independently, without requiring surrounding context to be understood.

C

Citation Density
A measure of how many distinct, quotable 100–400 token chunks appear per 500 words of content on a page.

F

FAQPage Schema
A specific schema.org type that declares a page contains a list of question-and-answer pairs, optimized for structured ingestion by search and AI systems.

G

Generative Engine Optimization
The practice of making a website more likely to be cited by AI answer engines (ChatGPT, Claude, Perplexity, Google AI Mode) rather than simply ranked on a traditional search results page.

I

Indexing API
An API — most commonly IndexNow (Bing/Yandex) or Google's Indexing API — that pushes URL changes to a search index in real time instead of waiting for crawlers.

L

llms.txt
A Markdown file at a site's root that tells AI crawlers what the site is about and which URLs are canonical — a kind of robots.txt for language models.

S

Schema Markup
Structured data embedded in a page (usually as JSON-LD) that describes what the page is about in a machine-readable vocabulary defined at schema.org.