Currently, the prevailing scientific view of Nature is that of Motion. We view natural phenomena primarily as the manifestations of physical interaction of objects. For example, organisms remain being terrestrial objects as a result of their interaction with the Earth. The new view is different: First of all, the organisms and the Earth exist. As a matter of fact, we observe different phenomena guided by different fundamental processes. The book describes the newly discovered process of Existence and its mechanisms. Thus it answers Wheeler's age-old question: "How come existence?" It also explains that existence is a physical State in which objects are abiding continuously. This answers question posed by Aristotle: "What is Being?" The book is the first scientific study of Existence. It is addressed to students and teachers of philosophy and science; as well as to the general audience of readers.