Answer engine

An answer engine is a search tool that replies to a question with a direct, written answer instead of a list of links. Perplexity, which calls itself one, describes an answer engine as "a tool designed to give you direct, detailed answers to your questions," and says it works by searching the web, identifying trusted sources and combining what they say into one response. ChatGPT search, Google AI Mode, Microsoft Copilot and Gemini answer in a similar way.

Researchers use a related term. The paper that introduced generative engine optimization calls these systems generative engines: they retrieve relevant documents and use large language models to generate a response grounded on those sources.

Why it matters for brands

A list of links leaves the comparison to the buyer. An answer engine does the comparing and names a few brands, often with a citation for each claim. Clicks fall when the answer comes first: Pew Research Center found that people who saw a Google AI summary clicked a traditional result in 8% of visits, against 15% without one, and a link inside the summary in only 1%. When the answer names a competitor and leaves you out, the buyer may never reach your site.

How to measure it

Ask each answer engine the questions your buyers ask, several times each, and log whether you are named, in what position, and which pages are cited. Answers vary between runs, so report the share of runs that name you, your AI visibility, rather than a single screenshot. If Perplexity names your brand in 6 of 10 runs for "best payroll software for a 20-person company", your visibility there is 60%. Track the other engines the same way and compare them side by side.