The shielding of electromagnetic fields and waves has long been a fundamental issue in electrical engineering. In order for electrical devices or systems to operate alongside each other without interference, shielding is often necessary to prevent influences. Other areas of application include shielded measurement and testing environments for high-frequency measurements and functional tests. The topic is particularly relevant due to applications related to information protection and protection against intentional electromagnetic interference. In the context of the discussion on electrosmog, many readers will appreciate uncolored background information. In addition to a detailed treatment of the theory, especially a contemporary interpretation of Heinrich Kaden's work, the book primarily focuses on practice: it illustrates solutions to specific techniques with numerous measurement results and illustrations.