Also called: schema.org, JSON-LD, rich results markup
Structured data is machine-readable markup (usually schema.org JSON-LD) that states explicitly what a page is about, removing ambiguity for search and answer engines and improving how a brand's entity is understood.
Structured data is markup — most commonly schema.org vocabulary in JSON-LD — that tells engines exactly what a page represents: an organization, a product, an article, a FAQ, a rating, and how those things relate. It converts prose that a machine must guess about into facts a machine can read directly.
For answer engines this matters twice over. It disambiguates a brand's entity (who you are, what you make, how to reach you), and it exposes specific claims in a form the engine can extract and attribute with confidence. Crucially, the markup must mirror what the page actually says — schema that asserts things the visible page does not is a spam signal and can hurt rather than help.
GeoMagics inspects the structured data present on a site as a core machine-readability lens, and flags both missing coverage and mismatches between markup and visible content.