Schema.org is a set of vocabulary (or schemas) employed to use structured info markup to Websites and articles. Effectively applying schema can improve Web optimization outcomes via rich snippets. Choose default class to be assigned to Shopify products in the event that no class is found even though importing product. https://addons.prestashop.com/en/seo-natural-search-engine-optimization/31857-automatic-google-rich-snippets-json-ld-open-graph-seo.html