Schema markup is a form of structured data (using JSON-LD, Microdata, or RDFa) added to a web page's HTML that helps search engines understand the meaning and context of the content. Schema types include Organisation, Product, Article, FAQ, BreadcrumbList, and more. Rich results in Google Search (star ratings, FAQs, breadcrumbs) are powered by schema markup.
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Schema Markup Guide
Structured data that helps search engines understand your website's content.