The word Steganography literally means ‘covered writing’ as derived from Greek. It encompasses all methods of secret communication that conceal the very existence of the message. Digital technology gives us new ways to apply Steganographic techniques including one of the most intriguing that of hiding information in the digital images. A popular method is the LSB encoding, so encoding and detection of LSB Steganography is discussed in detail. Steganography goes well beyond simply embedding text in an image. It also pertains to other media, including voice, text, binary files and communication channels. The importance of techniques that can reliably detect the presence of secret message in images is increasing. Research has been pursued in the study of estimating the initial bias from stego images to improve the sensitivity of the RS detection method to short messages in digital images