Structured Data

Strucutred Data in the broad sense is data that is organized in a way that makes it easily searchable and readable by data analysis tools, while unstructured data includes content like videos, emails, and images—data with no internal identifier to help search functions recognize it. I a more narrow, web development sense, structured data is a standardized way to provide information about a web page. It is most familiar as the markup that search engines like Google use to profile web pages.

This website is pretty well marked up with schema formats (and other microformats.

Elsewhere

• the Schema.org Community Group
• Introduction to structured data markup in Google Search