The formation of any hologram involves the exposure of a light-sensitive material to the holographic pattern resulting from the interference of object and reference beams. This recording process and the subsequent reconstruction of the resulting hologram are the essential steps of holography. They were considered carefully by Gabor (Ref. 1) and have since been examined theoretically and experimentally by many authors. It is the purpose of this paper to present a broad survey of the effects of hologram recording media, and to summarize in compact form the potential and actually observed properties of the various types of holograms resulting from the use of the different recording media. We shall also summarize the effects upon the reconstructed image of the detailed characteristics of some particular recording media. We shall concentrate on results, with few derivations of mathematical formulae or descriptions of experimental procedure.