When a message is buried within another item, such as a photograph or document, it is known as steganography. It is critical in steganography that only those who are anticipating the message are aware that it exists. One approach to steganography is to use a concealing cipher. Digital watermarking is another kind of steganography. Digital watermarking is the process of embedding a logo or brand in papers, images, or other things. The watermarks serve as a deterrent to unlawful use of the content.
Changing the least significant bit for each pixel in an image is the most popular method. Pixels are modified in this example in such a modest amount that the human eye cannot notice them.