Volcano Formation Process explores the fascinating yet complex world of volcanoes, delving into the Earth's inner workings to understand how these geological structures are created and how they erupt. The book argues that volcanic activity is a result of the interaction between deep Earth processes and surface conditions, connecting mantle dynamics, magma genesis, and structural geology to the various types of volcanic eruptions observed. One intriguing fact is that the structure of a volcano, including caldera formation and faulting, significantly influences its eruptive behavior. The book systematically progresses from the basics of plate tectonics and magma formation to the internal structure of volcanoes and specific eruption types, illustrated with case studies. Geophysical parameters, such as magma viscosity and crustal stress, are examined to reveal their roles in volcano development. Throughout, the book emphasizes the importance of integrating knowledge from Earth sciences like seismology and geochemistry to gain a holistic understanding of volcanic activity and natural hazards, while noting the challenges of long-term eruption forecasting.