Structured data testing, also known as schema testing, refers to the process of validating and evaluating the implementation of structured data markup on a website. Structured data refers to a specific type of code that is added to a webpage's HTML to provide search engines with additional information about the content on the page.
Structured data testing is essential for SEO as it helps search engines better understand and interpret the content on a webpage. It enables search engines to display rich snippets or enhanced search results, which can improve the visibility and click-through rate of the website on search engine results pages (SERPs).
During structured data testing, SEO professionals or webmasters use various tools, such as Google's Structured Data Testing Tool or the Rich Results Test, to examine the structured data markup implemented on a webpage. These tools analyze the code to ensure that it complies with the structured data standards and guidelines set by search engines, such as Google's structured data guidelines.
By conducting structured data testing, SEO practitioners are able to identify any errors or issues with the implementation of structured data markup and make necessary corrections to optimize the website for search engine visibility and user experience.