Steganography is the art of concealing messages into something innocuous in such a way that it is extremely difficult for someone to suspect, let alone find, a hidden message. The etymology of the word “steganography” comes from the Greek language and is translated as steganos-, or “covered”, and –graphie, or “writing”. So it literally means “concealed writing”.In the last few decades, Physical Stenography has led to Digital Stenography which in turn has given rise to Digital Image Stenography.
In Digital Image Steganography an image can be hidden in another image making it practically invisible and can only be accesed with a key to the image. The is a method for sending secret documents and hiding private information.
Source
GFI - Talk Tech to Me - The Threats of Steganography
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