The final paper on the subject of Information Operations of the United States of America was created with the aim of better understanding the management of complex and dynamic events in the world, with special reference to the American use of information operations. The work contains a conceptual definition for easier understanding and describes public diplomacy at the strategic level of communication and gradually reaches the tactical and operational level where information operations are carried out. The reason why most theoreticians are in favor of the American definition and concept of public diplomacy and information operations is that the USA is considered the cradle of public diplomacy and that they were the first to institutionalize the term in practice. But since the events of September 11, 2001, there has been a reversal in the implementation of public diplomacy, and the US has begun to face criticism for failing in this area. The paper focuses on changes in the implementation of public diplomacy after September 11, 2001, the reasons that led to it, and compares public diplomacy before 2001 and after 2001. Concluding the importance of media influence and why information operations are so important today.