Modern technology implies a modern way of communication, which can be public and secret. Everything that is mysteriously interested in man, starting from the very subject of work. Since this discipline is not known to the wider public and is in development, the first part of the paper describes the historical development of steganography. Based on historical development, the division and basic principles of steganography follow. We will get acquainted with the concepts of steganalysis and water seal, and its application. Simpler examples of the spatial domain method, the substitution of the least important bit and the hiding of the image in the picture, are represented in the paper. With the support in writing, I will attach an implementation part that will include hiding / detecting text and hiding / image detection. A comparison of images will also be made to find out whether the images are identical or different. Each given part of the program is based on the LSB method, and the entire program is created using the C # programming language.