This book introduces the reader to the field of the physics of processes occurring in porous media. It targets master and PhD students who need to gain fundamental understanding of the impact of confinement on transport and phase-change processes. The book gives brief overviews of topics such as thermodynamics, capillarity and fluid mechanics in order to launch the reader smoothly into the realm of porous media. In-depth discussions are given of phase-change phenomena in porous media, single-phase flow, unsaturated flow and multiphase flow. In order to make the topics concrete, the book contains numerous example calculations. Also, as much experimental data as possible is included to give the reader the ability to quantify phenomena.