# Structured data

Canonical HTML: /atlas/structured-data
Atlas version: atlas-2026-07-28-v1
Category: Content structure for machines

## Definition

Structured data encodes entities and relationships using a shared vocabulary such as Schema.org.

## How it works

JSON-LD can state article, product, organization, breadcrumb, or dataset properties explicitly while the visible page communicates the same facts to people.

## How to validate it

Validate syntax, compare structured values with visible content, and version both when facts change.

## Common failure

Markup that contradicts or invents visible content can be ignored and undermines trust in every machine-readable field.

## Related topics

- [Semantic HTML](/atlas/semantic-html)
- [Breadcrumb structure](/atlas/breadcrumbs)