Image steganography is the science of hiding data inside cover images for security. Images have a lot of visual redundancy in the sense that our eyes do not usually care about subtle changes in color in an image region. One can use this redundancy to hide text, audio or even image data inside cover images without making signi?cant changes to the visual perception. Image steganography is becoming popular on the internet these days since a steganography image, which just looks like any other image, attracts a lot less attention than an encrypted text and a secure channel.Steganography is the science of hiding messages in such a way that no one apart from the sender and the intended recipient, suspects the existence of the message. There are multiple techniques in order to embed data in an image, however some techniques are better at being undetected then others. These techniques depend on three different aspects: capacity, security, and robustness. Capacity refers to the amount of information that can be hidden in the cover medium. Security to an eavesdropper’s inability to detect hidden information. Robustness to the amount of modification the stego medium can withstand before an adversary can destroy hidden information.