Population Neuroscience is aimed at enhancing our understanding of forces that shape the human brain and, as such, contribute to inter-individual variations in cognitive abilities, behavior and mental health throughout the lifespan. This book builds on a monograph Population Neuroscience (published by Springer in 2013; ISBN: 978-3-642-36450-1), a recent book on "Digital Ethology: Human Behavior in Geospatial Context" (published by MIT Press in 2024; ISBN: 9780262548137), and the collaborative work carried in the CHARGE and ENIGMA Consortia. Using collective expertise and knowledge with combining epidemiology, genetics and neuroimaging, the authors provide an overview of the basic principles and current advances in this field.