Convergence and divergence of tectonic plates trigger the occurrence of volcanoes on Earth. Volatile activity in the tectonic plates causes sudden changes to magma chambers which leads to volcanic eruptions. Volcanoes are thus, a natural phenomenon usually formed due to the cracking of the topmost layer in planetary bodies like Earth. The scientific study of this natural hazard is called volcanology. This book is compiled to provide a detailed understanding of all aspects related to volcanoes and volcanology. It also explores the significance and function of the tools of volcanology that help in predicting the nature, behavior, and classification of volcanoes. Most of the topics introduced in this book cover new techniques and the applications of volcanology. It will prove to be immensely beneficial to students and researchers in this field.