Structured Data
Structured data is a standardized format that organizes a page's information so machines can read it without ambiguity.
Unlike free text, structured data specifies that a number is a price, that a date belongs to an event, or that a name belongs to an author. The most common format is JSON-LD.
Beyond classic search, structured data is becoming essential for generative AI systems looking for verifiable facts to cite. A well-marked-up site is easier to understand, for Google and for an AI assistant alike.