Machine-readable information describing the entities, attributes or relationships represented by content.
A practical example
A website uses JSON-LD to describe an organisation or eligible product information.
What to watch for
Markup must reflect the page accurately. Search engines can understand and use it without showing a rich result, and valid syntax alone does not guarantee eligibility.
Related reading
Explore Schema Markup and Rich Results. Try our noindex checker for a practical next step. See how this fits into Technical SEO.