The number of Netflix subscribers has grown from one million in 2002 to 10 million now, relying on the recommendation system. Big data helps Netflix understand the preferences of users. The content presented by 80% on the platform is deeply affected by big data. Real-time correction of recommended videos meets the needs of users, and the types of videos are not limited to specific categories; Netflix uses big data and algorithms to build a complete recommendation system to retain customers and save $1 billion. ...