Structured data is one of those SEO terms that sounds far more technical than it is. In practice, it’s just a standardised way of labelling the content on a page so search engines understand exactly what they’re looking at — that this is a product with this price, that this is a recipe with these ingredients, that this is an event on this date. Add it well and your pages become eligible for the eye-catching rich results that win clicks.
What structured data actually is
Search engines read your page’s text, but text is ambiguous. Structured data removes the ambiguity by describing content using an agreed vocabulary — schema.org — that Google, Bing and others all understand. It’s metadata: extra labels in the page code that say “this string is a price, that one is an author, this is a star rating.”
JSON-LD: the format Google prefers
There are three ways to write structured data — JSON-LD, Microdata and RDFa — but Google recommends JSON-LD, and it’s by far the easiest to work with. It’s a self-contained block of JSON you drop into the page’s code, separate from your HTML, so it doesn’t tangle with your markup or templates.
What rich results does it unlock?
Structured data is what makes the enhanced listings you see in search possible:
- Star ratings from Review or AggregateRating markup
- FAQ drop-downs from FAQPage markup
- Product price and availability
- Breadcrumbs in place of the raw URL
- Recipe, event, and how-to cards
- Sitelinks search box and richer knowledge-panel data
These listings take up more space and signal credibility, so they typically earn a higher click-through rate than a plain blue link in the same position.
Tip: Structured data doesn’t directly boost rankings, but the rich results it unlocks lift click-through rate — and better engagement is something Google notices over time.
How to add and validate structured data
The process is simple: choose the schema type that matches the page, write the JSON-LD, paste it into the <head>, and test it in Google’s Rich Results Test and the Schema.org Validator before shipping. Invalid markup is worse than none, so never skip validation.
Adding markup by hand works for a few pages. Across a whole site, a schema markup generator detects each page’s type and produces valid JSON-LD in bulk — including the Organization, WebSite and Breadcrumb markup most sites forget.
Frequently asked questions
What is structured data in SEO?
It’s a standardised way of labelling page content using the schema.org vocabulary so search engines understand it precisely — and can show rich results like star ratings, FAQs and product cards.
Is structured data a ranking factor?
Not directly. It makes pages eligible for rich results, which tend to earn a higher click-through rate. The engagement benefit is indirect but real.
What’s the difference between structured data and schema markup?
They’re used interchangeably. ‘Structured data’ is the concept; ‘schema markup’ is the schema.org implementation of it, usually in JSON-LD.