Schema Markup

Schema Markup refers to the specific implementation of structured data using the Schema.org vocabulary — a collaborative project launched by Google, Bing, Yahoo, and Yandex in 2011 to create a shared, standardized set of schemas for structured data on the internet. When developers or SEOs say "add schema markup to this page," they mean adding JSON-LD, Microdata, or RDFa code that uses Schema.org types and properties to describe what the page contains.

The Schema.org vocabulary encompasses thousands of types — from broad types like Thing, Person, and Organization, to highly specific types like MedicalCondition, SoftwareApplication, and VideoGame. Each type has defined properties: an Organization has name, url, logo, foundingDate, and contactPoint; an Article has headline, author, datePublished, and image. By using these standardized properties, content publishers speak a language that all major search engines and AI systems can interpret consistently.

For AI SEO, schema markup serves two critical functions: it provides unambiguous factual data that AI systems can extract with high confidence, and it signals content quality and organization to AI retrieval systems. Well-marked-up content is less likely to be misinterpreted — AI systems won't confuse a product price for a date or a byline for a contact email. This precision makes marked-up content more reliable as a citation source.

The most impactful schema types for AI SEO are FAQPage (for Q&A content), DefinedTerm (for glossary entries and definitions), Article and BlogPosting (for editorial content), HowTo (for instructional content), Product and Offer (for commerce), and BreadcrumbList (for navigation context). Implementing these consistently across a site is one of the highest-ROI technical AI SEO improvements available.

A software documentation site adds DefinedTerm and FAQPage schema to all its glossary and FAQ pages — resulting in those pages earning 3x more citations in AI search responses as systems can extract precise definitions and answers directly from the structured data.