Answer engine
A search experience that returns one synthesized answer with citations.
An answer engine combines information retrieval, natural-language processing and machine learning to return a direct, synthesized answer with citations, instead of a ranked list of links. Perplexity, launched in December 2022, is the canonical example: it pairs LLMs with real-time web retrieval and cites its sources inline. Google's AI Overviews (successor to the 2023 Search Generative Experience) launched to US users on 14 May 2024 and expanded to 100+ countries on 28 October 2024; other surfaces include ChatGPT search, Microsoft Copilot and Google's AI Mode.
The defining difference from classic search is the output: rather than ten links to click, an answer engine composes one response over multiple retrieved sources, surfacing them as citations. This drives "zero-click" behavior and shifts the optimization goal from ranking to being the cited source — the premise behind GEO, AEO and LLMO.
Sources
- AI Overviews in Google Search expanding to 100+ countries — Google (The Keyword)
- Perplexity AI (history & launch) — Wikipedia