The nature of philosophy is analyzed in the monograph. The purpose of the study is to reveal the possibility of philosophy, the real content (definition) of philosophy. To achieve this goal, the study aims to give an analyst a system of definitions of philosophy, which is formed by the relationship between philosophy and worldview, philosophy and science, philosophy and lifestyle, etc. The logic of research forms its structure, namely: a (general) introduction to philosophy, an analysis of philosophy as questioning (problem thinking) and an attitude to scientific knowledge in the form of a "philosophy of science."