Structured info is included to web page knowledge by marking-up data it describes with equipment-readable annotations (metadata) that tend to be invisible to human beings. This is certainly why it really is also known as schema markup I've a website wherever I am utilizing JSON-LD scripts to include structured knowledge. https://addons.prestashop.com/it/seo-indicizzazione-naturale/31857-google-rich-snippet-automatico-json-ld-open-graph-seo.html