Steganography is the practice of concealing a message, image, or file within another message, image, or file. Generally the hidden messages will appear to be part of something else: images or articles. The hidden message may be recorded in invisible ink only to be revealed when a UV light is shown on the message. The goal of steganography is to keep the message cryptic so it does not attract attention to itself.
Steganography includes concealment of information within computer files. In digital steganography, electronic communications may include steganographic coding inside of a transport layer, such as a document file, image file, program or protocol. Media files are ideal for steganographic transmission because of their large size.
http://en.wikipedia.org/wiki/Steganography
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