Structured data
A labeled layer of code added to a page that states what each part of the content means, so a machine reads facts instead of guessing from layout.
A person reads your page top to bottom. A machine reads the labels first and the prose second. Structured data is those labels.
What structured data is
Structured data is a layer of code that states plainly what each part of your content means. This text is a price. This block is a question and its answer. This is the business, and here is where it operates.
Without it, a machine sees text inside boxes and has to infer meaning from position and styling. With it, the page hands over facts instead of forcing a guess.
The reader here is not a person. It is an engine fetching your page, parsing it, and often answering the question itself.
Why engines read it first
An engine trusts what it can identify with confidence. A number labeled as a price is a fact it can lift cleanly. The same number sitting in a styled box with no label is something it might misread, or skip.
Structured data shrinks the guessing. The less an engine has to infer, the more accurately it can represent what your page actually says.
The old way and the new way
The old way treated structured data as an SEO add-on: bolt it on for rich results in Google, then forget it existed.
The new way treats it as the channel through which a machine understands the page at all. When the answer is built from your labels, those labels are the page, as far as the engine is concerned. In 2024, 58.5% of American Google searches ended without a click, according to SparkToro. When the answer is the destination, the machine-readable layer is doing the talking.
The damaging admission
Structured data drifts out of sync without anyone noticing. You add it once, then edit the visible text later and leave the labels behind. Now the page says one price and the markup says another, and a machine reading the label repeats a number you no longer charge.
Present is not the same as correct. Plugins like Yoast and Rank Math add baseline structured data and do it well, but they do not check whether each page carries the right markup, or whether it still matches the content after an edit.
How to check yours
Take one page and ask three things. Is there structured data at all. Is it valid. Does it describe the actual answer on the page, not just the logo and the menu.
Run a free scan on any URL to see what an engine reads, what is missing, and where the markup and the page disagree. For the hands-on version, read how to structure a page for AI answers.