Glossary
Prompt Engine
A prompt engine is a conversational system that interprets a natural-language request and generates an answer, often using a large language model plus search, retrieval and other tools. The term describes products such as ChatGPT, Gemini, Perplexity and Copilot rather than one specific technical architecture.
In plain terms
It is an AI product where people ask questions in their own words and receive a composed answer.
Why it matters
Prompt engines are becoming a discovery and evaluation channel, so brands need to measure what these systems say and which sources they use.
How to apply it
- Identify which prompt engines buyers actually use.
- Test the same buyer questions across each product.
- Measure mentions, citations and recommendations separately.
Example
A software buyer asks several prompt engines for a shortlist and receives different vendors because each product uses different models, indexes and instructions.
Sources
Related reading
Related terms
Back to the full glossary (75 terms).
Ranking is no longer enough
You need to be cited, mentioned, and recommended.
Being cited, mentioned, and recommended are three different outcomes, and most brands only ever achieve the first one. Ranking is no longer enough because AI engines answer buyers directly and name only a short list of vendors as the recommendation — everyone else is cited in passing, if at all. Get a free AI Visibility Report to see exactly where your brand appears today across ChatGPT, Google AI Overviews, Gemini, Perplexity, and Copilot, where competitors are winning the recommendation instead, and what's keeping you from moving up the shortlist.