Security researcher D..v..d ..uc .n..n created a JPEG image of Shakespeare that also included a RARed copy of his complete works in HTML format. Steganography is the act of hiding information or messages inside objects that are not themselves secret. This allows people to covertly distribute messages, files, and other types of data in files that appear to be non-secretive in nature. The technique also survives twitter’s thumbnailer 😛 pic.com/P0Owq9abRC.
Source: https://www.bleepingcomputer.com/news/security/complete-works-of-shakespeare-hidden-inside-twitter-thumbnail-image/