The internet is not simply changing, it is converging. Artificial intelligence, blockchain, the metaverse, quantum computing, and brain-computer interfaces are fusing into an integrated, intelligent, and autonomous digital ecosystem. Web X.0 will anticipate our needs, blur the boundary between physical and virtual, and reshape how people, organizations, and governments engage with one another. But every leap forward cast new shadows: more sophisticated cyberattacks, eroding privacy, ungoverned autonomous systems, and a digital divide that risks leaving billions further behind.

This book charts the full transformation of the web, from the static pages of Web 1.0 to the social platforms of Web 2.0, the decentralized protocols of Web 3.0, and onward to the intelligent, immersive world of Web X.0. It examines the technologies driving this shift, the security and governance challenges they create, and the social, ethical, and regulatory frameworks needed to manage them. Crucially, it treats these not as separate conversations but as one: Web X.0 is the sum of its parts and understanding it requires exactly the interdisciplinary lens this volume provides.

A distinctive feature is the book's grounding in the UN Sustainable Development Goals. The authors demonstrate, through real-world case studies and scenario-based analysis, how Web X.0 technologies can drive financial inclusion, transform healthcare, democratize education, and accelerate climate action. Technology, they argue, is not neutral. Deployed with intention, it can be a deliberate force for a fairer and more sustainable world.

Written for researchers, industry professionals, and policymakers alike, this is both a technically rigorous reference and a serious invitation to think about the digital future we are collectively building.