Structured data markup refers to the process of adding specific tags or code to a website’s content in order to provide search engines with more detailed information about the content. This allows search engines to better understand and categorize the content, making it more likely to appear in relevant search results. Structured data markup can include information such as product prices, ratings, and reviews, as well as event details, recipes, and more. By implementing structured data markup, website owners can improve their search engine visibility and provide a more informative and user-friendly experience for their audience.