Structured data is a standardized format of providing information about a web page to search engines. It uses specific vocabulary called schema markup to describe the content of a webpage in a way that search engines can easily understand. This structured data can help search engines to better understand the content and context of your website, which can lead to more accurate and relevant search results for users.

Structured data is typically implemented using HTML tags in the header section of a webpage, which provide additional information about the content of the page. This information can include details such as the type of content, the author, the date published, and more. Search engines then use this information to display rich snippets or enhanced search results for users.

There are several types of structured data that can be used, such as schema.org, which is a collaborative effort between Google, Microsoft, Yahoo!, and Yandex to create a common vocabulary for structured data markup. Other types of structured data include JSON-LD and RDFa.

Overall, using structured data on your website can improve your search engine visibility, increase click-through rates, improve the user experience, and enhance the mobile experience.