This paper summarizes and reviews research in electromagnetic interface (EMI) shielding based on the review of over 300 articles which are presented in four separate categories. It will be noticed, however, that some articles are cited in more than one category. At the end of each subcategory. a summary is given for easy reference. A table relating each subcategory to the given references at the end of this paper is also supplied. The document comprises a comprehensive study of basic concepts in EMI shielding, analytical and numerical modeling techniques, test methods and instrumentations, material selection, and factors involved in shielding degradation. Cost comparison for various shielding techniques, and the advantages and disadvantages of using the different types of shielding materials and testing methods are reviewed.