The document summarizes the evolution of the World Wide Web through four generations: Web 1.0 focused on commercial websites with limited content and creativity; Web 2.0 enabled user-generated content through blogs and social media but few people made money; Web 3.0 added cloud computing, portable internet access, and online businesses driven by user behavior and semantic web technologies, though security, privacy and reliability issues emerged; Web 4.0 is envisioned to have ultra-intelligent electronic assistants that know individual users well.