Steganography in general is known as the art or science of writing hidden messages in a way where others beside the sender and the receiver will know of its existence. There are different types of seganography. For example, there is Physical steganography, digital steganography, Network steganography, printed steganography, and steganography using Sudoku puzzles.
Digital Steganography is concealing messages digitally. These can be messages in sound files/ noisy images, concealing data within encrypted or random data, pictures, videos, and even in blogs. Digital Image Steganography is strictly speaking of digital pictures containing a hidden message. Something like this can be done by combining two files together. For example, one can take a picture of a bird which would be the target picture and combine it with the key image (message) and create an digital image steganography. The key image has to be extracted from the original image in order to observe the message.
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