The rapid growth of electronic gadgets has led to electromagnetic interference (EMI) as an off-shoot. This work is dedicated to develop a material which can be used as a shield for electromagnetic interference (EMI). For this purpose, hybrid composites were prepared using polypropylene random copolymer as matrix and combination of conducting (MWCNTs) or/and magnetic (Iron Oxide) or/and dielectric (Barium titanate) fillers. This book has been divided into three parts. The first part deals with the brief introduction of electromagnetic interference (EMI) and material requirements for EMI shielding. The detailed methods used for the preparation and characterization of MWCNTs, Iron Oxide, Barium titanate, and PPCP/hybrid composites are given in second part of the study while the impact of conducting (MWCNTs), magnetic (Iron Oxide) and dielectric (Barium titanate,) fillers on the properties of PPCP are highlighted in last part.