Schema markup (a form of structured data) is a standardized vocabulary of tags that you add to your website's HTML code. It translates your human-readable content into a language that search engine algorithms natively understand.
By using schema markup, you can explicitly tell Google 'this text is a recipe', 'this is a product with a 5-star rating', or 'this is a local business located at this address'. This helps search engines display 'Rich Snippets' in the search results—such as star ratings, event dates, or recipe cooking times—which significantly improves click-through rates.