SEO vs AIO vs GEO vs AEO: The Complete Guide to AI Search Optimisation in 2026
A comprehensive guide to the four layers of modern search visibility: SEO (Search Engine Optimisation), AEO (Answer Engine Optimisation), GEO (Generative Engine Optimisation), and AIO (AI Optimisation). Explains what each layer means, why the shift from ten blue links to AI-generated answers changes everything, how the layers work together, and provides detailed implementation tactics for each. Covers structured data, entity optimisation, citation earning, trust signal building, and how to measure success across all four layers. Includes common mistakes, priority order for implementation, and practical examples for SaaS and eCommerce businesses.