Water marking is the art of hiding the fact that communication is taking place, by hiding information in other information. Watermarking is still a challenging research field with many interesting problems such as Robustness to both geometric and nongeometric attacks with blind detection, Other attacks such as protocol attacks and cryptographic attacks , Correct recovery of multiple-bit message, Public-key detection. Many different carrier file formats can be used, but digital images are the most popular because of their frequency on the internet. For hiding secret information in images, there exist a large variety of invisible water marking techniques some are more complex than others and all of them have respective strong and weak points. Different applications may require absolute invisibility of the secret information, while others require a large secret message to be hidden. Here in this review of various techniques is discussed. DWT, DCT and LSB used for watermarking to provide protection against unauthorized persons who can make misuse of data or images. LSB method show more clarity on the secret images. DWT-Based watermarking methods are fast /robust and protect against most forms of manipulation. Schemes based on pixel dependency are robust in most forms of image manipulation, but fail when significant pixels are moved from their original location.