Structured data turns "a heading and some text" into explicit facts a machine can trust — this is the business name, this is its address, this is a price, this is the author. It is usually implemented with Schema.org vocabulary in JSON-LD format.
Humans read layout and context; machines need the meaning spelled out. Structured data is the difference between an agent guessing what your page is about and an agent knowing.
Without structured data, "070-763 09 09" is just digits on a page. With it, the page declares this is the telephone number of a specific organisation — so an agent can use it confidently.
Why this matters for AI findability
Structured data is the single most important technical lever in agentic findability. It gives AI systems unambiguous facts about your entity, which is exactly what they need to represent and recommend you accurately.