Steganography can be defined as the study of invisible communication that usually deals with the ways of hiding the existence of the communicated message. Steganography is often confused with cryptography but they are different with respect to processed output; the output of steganography operation is not apparently visible but in cryptography the output is scrambled so that it can draw attention. Steganlysis is process to detect of presence of steganography. In this I have analyzed different steganographic techniques, overview of steganography, different methods of steganography, its applications.