The book is a modern primer on propaganda. Disinformation, trolls, bots, information influence, psychological operations, information operations and information warfare. PROPAGANDA offers a contemporary model for thinking about the subject. It puts them in their proper place. The first two decades of the 21st century have brought qualitative and quantitative technological and societal changes, and the subject of Information Influence needs to get re-ordered. Now is the time. Information influence in the third decade of the 21st century culminates in two events. The first is the COVID 19 pandemic. This was a time when information influence was particularly relevant, with ubiquitous reports and news about the threats and risks. The war in Ukraine is another critical event. Propaganda and information warfare were used on a daily basis. This war was undoubtedly one of the moments when we were reminded of the existence of propaganda methods. The book explains the origins of the meaning and phenomenon of propaganda. Where it came from and how it has changed over the centuries. The book covers modern methods, including AI or advertising technologies. Legal, political, diplomatic and military considerations ensure that the material is covered in depth. The book is recommended for security and cybersecurity professionals (both technical and non-technical), government officials, politicians, corporate executives, academics and students of technical and social sciences. Adepts with an interest in the subject will read it with interest.