This book contains of five Sections with 13 Chapters in total and in each of these chapters the primary aim is to deliver the basic knowledge of the engineering materials. All topics are covered starting with Kinetics, thermodynamics & crystallographic aspects of engineering materials, the Atomic Structures and Bonding in solids, elaborates on the Structure of the Crystalline solids, Thermodynamics of Solids constitutes of discussion on Structure and Composition of the Phase Diagrams, Strengthening of material and at the last section takes into account the Economic, Environmental and the Social issues associated with the utilization of these Engineering Materials.