This article defines Generative Engine Optimization (GEO) and explains how AI-first discovery is changing user behavior. It compiles evidence of growth in AI search usage (Pew Research, Perplexity query volumes) and the expansion of Google’s AI answer features. It contrasts GEO with classic SEO, providing a field-tested playbook: answer-first content with authoritative citations, entity clarity via JSON-LD and public knowledge graphs, and AI visibility KPIs. It outlines measurement methods (Answer Inclusion Rate, citation share), team processes, and ethical considerations. The conclusion provides a step-by-step plan to adopt GEO within one quarter.