Ontology and the Question of Existence: A Clear Introduction to Being, Reality, What It Means Exist

What does it mean to exist? Ontology and the Question of Existence offers a clear and accessible introduction to one of philosophy's oldest and most fundamental fields. Beginning with ordinary objects and everyday language, it explores the deeper questions hidden beneath familiar assumptions: What kinds of things are real? Are properties, numbers, events, institutions, minds, and fictional characters genuine parts of reality? What makes something remain the same through change? Can absences, possibilities, or digital objects exist? Drawing on thinkers from Aristotle and René Descartes to Saul Kripke, David Lewis, Kit Fine, Sally Haslanger, and contemporary philosophers of mind, society, mathematics, and technology, the book explains major ontological theories without assuming previous philosophical training. Difficult ideas such as substance, universals, grounding, possible worlds, personal identity, consciousness, social construction, and artificial agency are introduced through concrete examples and precise arguments. The discussion also shows why ontology matters beyond academic philosophy. Questions about what exists now shape debates involving artificial intelligence, digital ownership, institutional responsibility, social categories, modern physics, personhood, and the status of increasingly complex technological systems.