Standardized JSON-LD or microdata embedded in HTML that tells search engines and AI systems the meaning of page content (e.g., this is a product, this is a FAQ, this is a person).
Schema markup uses the Schema.org vocabulary — a joint Google/Microsoft/Yahoo project — to label entities on a page. Common types: Organization, Product, Article, FAQPage, HowTo, BreadcrumbList, Review, SoftwareApplication.
For AEO, the highest-leverage schemas are FAQPage (extracted directly into AI answers), HowTo (used for step-by-step queries), and Organization+SoftwareApplication (build entity authority). Validators: Google's Rich Results Test and Schema.org's validator.
VibecodeAEO scans your site for all AEO factors weekly and tells you exactly what to fix.