Schema markup is a form of structured data that helps search engines understand the content and context of a webpage more effectively. It uses a standardized vocabulary, often in JSON-LD, RDFa, or Microdata formats, to label and categorize elements like products, reviews, events, people, or articles.
By adding schema markup to a website, businesses can enhance search engine results with rich snippets, such as star ratings, prices, or event dates, which improve visibility and click-through rates. It also helps search engines index content more accurately, potentially boosting SEO and providing a better user experience.