Over recent years, we have observed intensive progress in digitization and computerization. The development of the Internet has created space for communication and facilitated the process of transmitting information. A fundamental element of security and the feeling of lack of threat is providing truthful content. However, more and more often we come across false information, which becomes a tool of manipulation and disinformation in order to falsely inform the public about various important issues of social life. The aim of the article is to present the problem of disinformation as a tool of manipulation, present disinformation techniques that are used in cyberspace and indicate how to effectively fight disinformation online. The research problem is an attempt to answer the question whether disinformation is a tool for manipulating users on the Internet? The research method used in this article is the analysis of existing data (desk research) based on the subject literature and available Internet sources.