GEO (Generative Engine Optimisation)The practice of structuring content, entity signals and schema so that AI language models — such as those powering ChatGPT, Perplexity and Google AI Overviews — cite a business accurately when generating answers to relevant queries.AEO (Answer Engine Optimisation)The production of question-and-answer content aligned to the specific query patterns that AI engines retrieve when generating direct answers, enabling a business to appear in AI-generated responses before the user visits any website.CitabilityThe degree to which a business is referenced in AI-generated answers for relevant queries. Citability is a function of structured data quality, content specificity, factual accuracy and the presence of consistent entity signals across indexed sources.AI OverviewA Google feature that generates an AI-produced summary at the top of applicable search results pages, drawing on indexed web content and citing sources independently of the traditional organic and local-pack results.Entity signalA consistent, cross-referenced data point — such as a business name, address, phone number or professional accreditation — that appears in multiple indexed sources and helps AI systems identify and accurately describe a specific business.Citation frequencyThe rate at which a business is named or referenced in AI-generated answers when a defined set of target queries is tested. Used as the primary metric for tracking GEO and AEO performance over time.