Steganography is one of the methods of secret communication that hides the existence of hidden message. It can be defined as the study of invisible communication that usually deals with the ways of hiding the existence of the communicated message. The hidden message may be text, image, audio, video, etc. The files can be a cover image after inserting the message into the cover image using stego-key. It is reffered to as stego-image. Steganography is now more important due to the exponential growth and secret communication of potential computer users on the internet. In this paper I have analyzed various steganographic techniques. It also given an overview of steganography, different methods of steganography, its applications, how it is different from cryptography.