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The development of the internet, particularly the World Wide Web, is currently hitting its limits—both technically and socio-culturally, as well as economically. A new internet is promised as a solution, one that aims to overcome the boundaries between the real and the virtual world, merging reality and digitality—the metaverse. Technical, semantic, and organizational details are closely intertwined in this context. But what does this mean upon closer examination? What technical and technological challenges must be overcome to achieve such a merging? What economic opportunities arise—and which ones may be precluded? How can we ensure that an open and universally accessible metaverse is created? And how can we prevent a few large providers from imposing their proprietary ideas in this new metaverse? This book aims to provide answers to these questions. The metaverse—a term that is widely known and used by many people. Nevertheless, discussions often reveal that each user has their own individual idea of what the term means. For this reason, it is essential to precisely define and consider the term metaverse as well as all related terms such as Virtual Reality (VR), Augmented Reality (AR), Mixed Reality (MR), and Extended Reality. Front Matter Metaverse? Where from … Where to … or: What at All The Merging of Worlds and … of Immersion Another Dimension: Economic Merging What Must Not Be Missing: Criticism The True Vision Now is the Time to Build! Addendum 1—Because of its Relevance: Artificial Intelligence in the Metaverse? Addendum 2—Almost Even More Relevant: Is the Hype Already Over?