The rapid development of multimedia and internet allows for wide distribution
of digital media data. It becomes much easier to edit, modify and duplicate
digital information .Besides that, digital documents are also easy to copy and
distribute, therefore it will be faced by many threats. It is a big security
and privacy issue, it become necessary to find appropriate protection because
of the significance, accuracy and sensitivity of the information. Steganography
considers one of the techniques which used to protect the important
information. The main goals for this paper, to recognize the researchers for
the main fundamentals of steganography. In this paper provides a general
overview of the following subject areas: Steganography types, General
Steganography system, Characterization of Steganography Systems and
Classification of Steganography Techniques.