Hybrid Engine Optimization (HEO) in 2026 is an advanced SEO strategy designed to help businesses stay visible across both traditional search engines and AI-powered platforms. As search behavior continues to evolve, users are no longer relying only on Google; they are also using AI tools like ChatGPT, Perplexity, Gemini, and Google AI Overviews to find instant answers. This shift has made traditional SEO alone insufficient for long-term digital visibility.