Hybrid war represents one of the most used terms in the area of military and security affairs in the last years, especially after the outbreak of conflict in Ukraine. It appears still more frequently not only in scientific or specialized military or security publications, studies or articles, but also in various journals, news, reports or debates out of military or security community. It might be seemed that it is a new term or even new type of conflict, but it is not. Hybrid war is really no new phenomenon, it is known for many years; however, after the Russian annexation of Crimea, it is much more popular and used. On the other hand, the majority of wider public do not know what the mentioned term exactly represents, and that is the reason why an author of the article deals with this topic and, through gained results of the research, tries to explain the essence of examined problem.