The digital marketing landscape is undergoing a seismic shift as traditional SEO struggles to keep pace with AI-powered search engines like Google AI Overviews, Perplexity, and ChatGPT. Generative Engine Optimization (GEO) is emerging as the new frontier, demanding a radical rethink of how content is structured, presented, and ranked. This comprehensive guide dives deep into the mechanics of AI search, reveals why CTR is plummeting in AI-dominated SERPs, and equips you with actionable tactics—from crafting quotable definitions to leveraging expert citations and structured data—to ensure your content stands out in an era where machines, not humans, are the primary audience.