Structured data, also called schema markup, is a type of code that makes it easier for search engines to crawl, organize, and display your content.

Structured data communicates to search engines what your data means. Without schema markup, search engines can only tell what your data says, and they have to work harder to determine why it’s there.

structured data refers to information with a high degree of organization, such that inclusion in a relational database is seamless and readily searchable by simple, straightforward search engine algorithms or other search operations; whereas unstructured data is essentially the opposite.