TikTok's system works by using machine learning algorithms to analyze user data and deliver personalized content. The service is delivered through a combination of cloud$-$based and on$-$premises information systems. TikTok's system is designed to be scalable and efficient, allowing it to handle the large amount of data that it processes. TikTok's system works by using machine learning algorithms to analyze user data and deliver personalized content. Eloborate and explain it