Generative Engine Optimization (GEO) marks the next evolution of SEO. In 2025, visibility is no longer about ranking but about being referenced inside AI-generated answers. This guide explains how generative engines like Google’s AI Overviews and ChatGPT Search are reshaping digital visibility — and what CMOs must do to adapt. Learn the core principles of GEO, how it differs from SEO, and the steps to future-proof your content strategy.