  With the rapid development of various multimedia technologies, more and more
multimedia data are generated and transmitted in the medical, commercial, and
military fields, which may include some sensitive information which should not
be accessed by or can only be partially exposed to the general users.
Therefore, security and privacy has become an important, Another problem with
digital document and video is that undetectable modifications can be made with
very simple and widely available equipment, which put the digital material for
evidential purposes under question .With the large flood of information and the
development of the digital format Information hiding considers one of the
techniques which used to protect the important information. The main goals for
this paper, provides a general overview of the New Classification Methods for
Hiding Information into Two Parts: Multimedia Files and Non Multimedia Files.
