Google rolled out BERT towards the end the 2019 and called it their biggest algorithm update in almost 5 years, since RankBrain. BERT was basically the stamp that Google had moved past indexing pages based on keywords, and juggernauting to index entities rather, as entities are language agnostic - giving search an overhauling. With the focus shifting to entity optimizations, schemas play an integral role as they function in entity recognition by giving search engine bots context of the website content and the relationship between entities on the website.