Wikipedia defines steganographys as the art and science of writing hidden messages in such a way that no one apart from the intended recipient knows of the existence of the message. One of the areas in which steganography has found an audience is pornography, particular the trading of illegal images involving minors. The illicit images are hidden in what would otherwise be innocent photographs of seascapes and sunsets. Only a person having the proper software can extract the images.”]
Source: https://www.csoonline.com/article/2136567/hiding-in-plain-view–steganography.html