This chapter contains sections titled: Introduction to Supercapacitors (Current Technology State and Literature Review) Main Types and Structures of Supercapacitors Physical/Electrochemical Processes in Supercapacitors Supercapacitor Components Assembly and Manufacturing of Supercapacitors Supercapacitors Stacking and Systems Supercapacitor Performance, Testing, and Diagnosis Supercapacitor Configurations Applications Challenges and Perspectives of Electrochemical Supercapacitors References