A much-needed work that provides an authoritative overview of the fundamental biological facts, theoretical models, and current experimental developments in this fascinating area. Cell motility is fundamentally important to a number of biological and pathological processes. The main challenge in the field of cell motility is to develop a complete physical description on how and why cells move. For this purpose new ways of modeling the properties of biological cells have to be found - and this volume is a major stepping-stone along the way.