The past few years have seen an increasing interest in porous metallic materials, especially in foams made of aluminum or aluminum alloys. The stimulus for this lies in recent process developments which promise materials with better quality and lower cost. Moreover, the environment for the application of new materials has greatly changed. Nowadays higher demands for passenger safety in automobiles or for easy materials recycling make metal foams attractive where, a few years ago, the same material would have been ruled out for technical or economical reasons. This handbook gives any materials scientist and engineer involved in the research, development and application of metal foams an overview on the most recent results on new production processes, applications and industrial uses as well as the important topic of characterization and properties of these advanced materials.