The article describes Islamism as a multifaceted, multidimensional and constantly changing phenomenon. Islamism has many levels and manifestations. It is impossible to comprehend modern Muslim (and even more so Arab) societies without taking into account the influence of Islam as ideology, cultural environment, modality and way of life at the same time. It would be a mistake to represent Islamism as a node on the body of Muslim societies. In fact, Islamism largely reflects the essence of modern Muslim societies, the way of thinking and life of the majority of their population. Islamism in many ways helps to support social, economic, political and various other subsystems at different levels of society. It also creates a kind of Islamic model of modernization. In the article, the authors present their own vision of the reasons and grounds for the extensive and profound integration of Islamism into Muslim societies. Theyexaminefunctionsandaspects.