This book outlines the processes and applications of electrochemistry in detail. It includes detailed explanation of the various concepts and uses of the subject. Electrochemistry, as a branch of physical sciences, examines the relation between electricity and the chemical changes caused by it. Electrochemical engineering deals with the refining of metals as well as processes like electroplating. Such selected concepts that redefine this subject area have been presented in the text. While understanding the long-term perspectives of the topics, the book makes an effort in highlighting their impact as a modern tool for the growth of the discipline. It will serve as a reference to a broad spectrum of readers especially in the fields of chemical engineering, material science and metallurgy.