Schema.org is a vocabulary representing common data structures and their relations. Schema.org can be exposed as JSON-LD, microdata and RDFa. Extracting semantic data exposed in the Schema.org vocabulary is supported by a growing number of companies including Google (Search, Gmail), Yahoo!, Bing and Yandex. Data models provided by Schema.org are popular and have proved efficient. They cover a broad spectrum of topics including creative work, e-commerce, event, medicine, social networking, people, postal address, organization, place or review. Schema.org has its roots in a ton of preexisting well designed vocabularies and is successfully used by more and more websites and applications.