Article from SOFREP about how terrorist organizations are hiding and transmitting information:

In the digital world the most common form of steganography is embedding information in media files. Media files are rather large, so a little data padding isn’t as noticeable. They are also created with layers of information, which allows the embedding of other data into a layer, and keeps it obscured behind preceding layers – kind of like slipping a tiny, extra piece of cheese into a dagwood sandwich.