Abstract: Steganography is used for secure transmission of secret information by hiding information behind a cover object. Various types of steganography have been used for security of data. Text, audio, image and video steganography were utilized for different purposes. Video steganography can be used for more data to be transmitted under different frames of video. In these paper different types of steganography and different approaches for steganography has been reviewed. On the basis of study of different approaches approach for steganography can be easily adopted.

Keywords: Steganography, Audio Steganography, Video steganography, Security, LSB, MLSB.