Schema markup is table stakes for GEO. FAQPage, HowTo, Article, Product, and Organization are the schemas AI engines weight most. The presence of well-formed schema does not guarantee citation, content quality matters more, but its absence is a structural disadvantage when models are deciding what to extract.
GEO glossary
Schema markup
Schema markup is structured-data annotation, usually JSON-LD, that labels page content with explicit types like Article, FAQ, or Product so AI engines can parse it accurately.