# What is Structured data?

Source: https://mushbloom.uk/resources/glossary/what-is-structured-data.html

By Mushbloom. Published and updated: 2026-10-12.

## Definition & overview

Structured data is machine-readable markup describing page content and relationships using a shared vocabulary such as Schema.org. It should reflect visible, accurate content and does not guarantee rich results or AI citations.

## Analogy & mental model

It is a standardised label on the document, not extra evidence that the document is correct.

Choose a valid type, match the visible content and validate the markup before publishing.

## Why it matters

Consistent machine-readable descriptions can clarify what a page contains and how its entities relate. They work best when they reflect useful visible content. Incorrect or exaggerated markup introduces confusion rather than compensating for weak content.

## Practical business example

A glossary uses DefinedTerm for definitions and a breadcrumb list for navigation, while an implementation guide uses Article for its editorial content.

Illustrative scenario, not a client case study or promised result.

## How it works

1. Choose a vocabulary and type appropriate to the page’s actual purpose.

2. Describe visible facts and connect entities using consistent identifiers.

3. Validate syntax and applicable requirements, then inspect what is actually served.

## Core components

- Vocabulary and type

- Accurate properties

- Validation

Valid markup does not guarantee rich results, better rankings or AI citations.

## Structured data vs Page copy

Visible copy explains the subject to readers. Structured data describes that content in a standard form; it should not introduce claims absent from the page.

## Frequently asked questions

What does Structured data mean?
Structured data is machine-readable markup describing page content and relationships using a shared vocabulary such as Schema.org. It should reflect visible, accurate content and does not guarantee rich results or AI citations.

How is it different from Page copy?
Visible copy explains the subject to readers. Structured data describes that content in a standard form; it should not introduce claims absent from the page.

What is a sensible first step for a small business?
Choose a valid type, match the visible content and validate the markup before publishing. Choose a vocabulary and type appropriate to the page’s actual purpose.

What limitations should I keep in mind?
Valid markup does not guarantee rich results, better rankings or AI citations.

## Sources

Google: Structured data introduction: https://developers.google.com/search/docs/appearance/structured-data/intro-structured-data

No rankings, AI citations or commercial outcomes are guaranteed.