The ever-increasing use and technological advancement in the electronic industry has led to an unwanted product known as the electromagnetic interference (EMI), which can harm other electronic devices and even human beings. This has led to extensive research in the area of EMI shielding. The conventional EMI shields were mostly metallic in nature; however, they had several disadvantages such as high cost, chance of corrosion, heavy weight, etc. This has led to the research on new materials for EMI shielding, ranging from polymeric composites, conducting polymer-based materials, porous materials for EMI shields, biodegradable and bio-derived materials for EMI shields, high-temperature EMI shields, ceramic and cement-based EMI shields, EMI shields based on textile materials, etc. The present book describes EMI shielding starting from the basics and mechanism of EMI shielding, testing methods to determine EMI shielding efficiency of different types of materials used in the current scenario to different types of EMI shielding materials that are being used.