1. In ordinary photography, each part contains information of the original object separately and in case some part of the object is destroyed then the information of that part of the object is also lost. How ever in case of a hologram, even the smallest par of the hologram contains complete information of the object and as such destruction of a part of hologram does not cause any harm so far as the information of the object is concerned.
2. In ordinary photograph, we cannot record many images of the different objects on a small photographic film simultaneously as we cannot get any information by superimposing number of photographs on a small film. However in case of a hologram, large number of images can be recorded simultaneously. For example a photograph of the size 6*9 mm can record one printed page while the same size can record about three hundred such pages.
3. On a hologram, the pattern of images are formed using a particular sit of wavelets. In order to get the information from the hologram, same set of wavelets are to be used. In this way secret information can be recorded on a hologram as for decoding only the original wavelets have to be used and these are known to the person who recorded the information on the hologram.
4. These days holography has improved and holograms can be viewed by white light as well.
5. Recently coloured holograms have also been developed by Russian scientists using the coloured photography techniques.