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Steganography is the technique of hiding the fact that communication is taking place, by hiding data in other data. Many different carrier file formats can be used, but digital images are the most popular because of their frequency on the Internet. For hiding secret information in images, there exist a large variety of steganographic techniques. Steganalysis, the detection of this hidden information, is an inherently difficult problem. In this paper, I am going to cover different steganographic techniques researched by different researchers.