This book provides an introduction to the current state of our knowledge about the structure of matter. Gerhard Ecker clearly describes the development of modern physics from the beginning of the quantum era to the Standard Model of particle physics, the comprehensive theory of the fundamental interactions of the microcosm. The focus is on the most important discoveries and developments, such as quantum field theory, gauge theories, and the future of particle physics. The author particularly emphasizes the interplay between theory and experiment, which helps us to explore the deepest mysteries of nature. "Particles, Fields, Quanta" is written for anyone who enjoys physics. It offers high school graduates and students in their early semesters of physics motivation to understand the subject more deeply. Teachers and others interested in physics will also find it appealing.