Security issues are taken into consideration for many applications, where transfering sensitive data over network must be protected from any man-in-the-middle attackers. proivacy of data can be granted using encryption, by changing transmitted data into cipher form. Apart from encryption, hiding of data represents another technique to transfer data without being noticble by an attacker which is called Steganography. In this paper, we will discuss the main concepts of Steganography and a carrier media that is used for this goal.