Structured knowledge is additional on to a web site's HTML markup. Engines like google use structured data to make rich snippets, which might be little parts of information that may then seem in search results. This dramatically increases the user knowledge for the people trying to get event-related information and https://www.presta-addons-modules.com/en/opencart-seo-automatic-google-rich-snippets-json-ld-integration-opengraph-twitter-tags-schemaorg.html