Microdata is a part of the “WHATWG HTML Standard.” It's used to nest the metadata within the content on web pages, allowing the search engines, web crawlers, and browsers to extract and process Microdata from a web page and provide a better browsing experience.
The Microdata uses a supporting vocabulary to assign specified values to item attributes. Google and other search engines support Schema.org vocabulary. Schema.org comes with a standard set of type names/property names and commonly used markup vocabularies.
Added Support for microdata tags does not require any action from the admin or website user; this feature is added to the component's core.
You can use the Structured Data Testing Tool to check how it works in practice. The test requires adding a link to the single ad. As a result, we receive a report, similar to the example below.