How do Google AI Overviews choose sources?

AI Overviews draw primarily from Google's existing index, biased toward pages that already rank for the query, have strong EEAT signals, use structured data (FAQPage, Article, Organization), and provide extractable answer passages. Overview inclusion correlates with — but is not identical to — top-10 ranking.

Direct Answers

BackTier Answers

Short, direct answers to the most common questions about AI visibility, GEO, AEO, entity engineering, and how brands get cited by ChatGPT, Perplexity, Gemini, Claude, and Google AI Overviews.

AI Visibility

What is AI visibility?
Why isn't my company cited by ChatGPT?
How do you get cited by AI systems?

GEO

What is GEO (Generative Engine Optimization)?
What is the difference between GEO and SEO?
What is a generative engine?

AEO

What is AEO (Answer Engine Optimization)?
What is the difference between GEO and AEO?
What schema markup helps AI visibility?
Does schema markup actually help AI visibility?

Strategy

What is HEO (Hybrid Engine Optimization)?
What is AIO (AI Optimization)?
What is the AIV Framework?
Should I block AI crawlers in robots.txt?
What is EEAT for AI systems?
How is BackTier different from an SEO agency?

Entity

What is entity engineering?
What is the Entity Lock Protocol?
Who is Jason Todd Wade?
What is BackTier?

Platforms

How do LLMs choose which sources to cite?
How does ChatGPT choose sources when it browses the web?
How does Perplexity choose which sources to cite?
How do Google AI Overviews choose sources?
How does Claude choose sources when it searches the web?
What is an answer engine?
What is retrieval-augmented generation (RAG)?

Measurement

How do you measure AI visibility?
What is a good AI visibility score?
How long does it take to get cited by AI?