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Citable

Definition

Answer engine

An answer engine is a system that responds to a question with a synthesised answer rather than a ranked list of links. Modern answer engines — Google AI Overviews and AI Mode, Perplexity, ChatGPT search, Claude with web search and Microsoft Copilot — retrieve passages from the web and generate the answer with a large language model, usually with citations to the sources used.

The phrase predates large language models: featured snippets and voice assistants were the first answer engines, returning a single passage instead of a list. What changed after 2022 is that the answer is now generated — composed from several passages — and that the system attaches citations, which makes "being cited" a measurable outcome.

Related terms

Guides that use this term

  • Fundamentals

    What is Answer Engine Optimization (AEO)?

    Answer Engine Optimization (AEO) is the practice of structuring content so that AI-powered answer engines — ChatGPT, Perplexity, Claude, Copilot and Google's AI Overviews — can retrieve it, understand it and cite it inside a generated answer. Where classic SEO competes for a ranking position, AEO competes for extraction: a self-contained passage that resolves one question, from a page with a clear author, date and sources.

    6 min read