The book "What is mathematics" by Vladimir Ilyich Arnold is not just a textbook, but a real philosophy of mathematics, which opens the world of numbers, forms and logical structures to the reader. Arnold, a well-known Russian mathematician and popularizer of science, seeks to answer the question of what mathematics is, how it is formed and what role it plays in our lives. This book will become a real treasure for those who want to understand more deeply not only the science itself, but also its impact on the world around them. From the first pages, Arnold immerses the reader in a fascinating journey through the basics of mathematics, from simple concepts to complex concepts. He masterfully explains how mathematics permeates all aspects of our lives, from everyday tasks to high technology. The reader will be able to see how mathematical ideas shape our perception of reality, how they help in solving practical problems and how they serve as the basis for scientific discoveries. This book will be interesting not only for students and schoolchildren, but also for adults who want to refresh their knowledge or just learn more about how mathematics works. Arnold writes in accessible language, avoiding excessive formalization, which makes his thoughts understandable even to those who do not have deep knowledge in this area. Nevertheless, the book is not without depth and offers many interesting tasks and examples that will make the reader think and reflect. One of the key topics raised in the book is the connection of mathematics with other sciences and art. Arnold shows how mathematical models help describe physical phenomena, how they are used in biology and even in sociology. This interdisciplinarity makes the book especially valuable for those who are interested not only in mathematics, but also in its application in various spheres of life. Arnold's style is clear and logical, which makes his works easy to perceive. He uses a lot of real-life examples to illustrate his ideas, which makes reading not only cognitive, but also fascinating. Readers familiar with his other works, such as "Geometry and Algebra" or "Mathematics for the Humanities", will appreciate his ability to explain complex things in simple language. The book What is Mathematics also raises important questions about the role of mathematics in education and how it can be made more accessible to a wide audience. Arnold calls for a rethinking of approaches to teaching mathematics, which makes his ideas relevant and important for educators and parents. If you are looking for a book that will help you understand what mathematics is and how it affects your life, "What is mathematics" by Vladimir Ilyich Arnold will be an excellent choice. This work will not only expand your horizons, but will also inspire further study of this amazing science. Read, reflect and discover the world of mathematics, which, as Arnold shows, is much wider and more interesting than it seems at first glance.