The simulation hypothesis asks whether reality could be generated by an informational or computational system rather than existing exactly as ordinary perception suggests. The Digital Metaphysics of Existence examines this provocative possibility through philosophy, information theory, artificial intelligence, consciousness studies, and contemporary metaphysics. Drawing on computational ontology and debates about simulation, the book explores what it means for something to be real, whether consciousness could be simulated, and how information might relate to existence itself. Readers are guided from classical philosophical questions toward modern technological arguments without treating speculation as established fact. Readers gain a structured framework for understanding the subject and its broader consequences for future study, across science, society, technology, policy, ethics, and informed future decision-making today today.