Textbook in PDF format This book describes the different tools that have been developed during the last decades to explain how scientists study volcanoes. It takes into consideration volcanology as being a complex field at the interface between geology, geochemistry and geophysics and provides information about these aspects to embrace the diversity of a volcanic system. The book also provides an outlook to which direction this research is leading. It offers a hands-on experience directly useful if the reader wants to start applying the principles exposed