Metal foams are lightweight materials inspired by structures in nature. They are defined as three-dimensional frameworks with interconnected porous structures - nano-, meso- and macropores - that combine essential physical and mechanical features of metals with a highly porous nanoarchitectures. These types of porous materials can be used in a variety of different scientific fields and, as a result, have gained increasing attention in recent years. Given the heightened academic and industrial interest in efficient materials, sparked by the high demand for new clean technologies, this book is more relevant and timelier than ever.