In political science, the term class struggle, class conflict, or class war refers to the economic antagonism and political tension that exist among social classes because of clashing interests, competition for limited resources, and inequalities of power in the socioeconomic hierarchy. In its simplest manifestation, class struggle refers to the conflict between classes within class systems .
In the writings of several leftist, socialist, and communist theorists, notably those of Karl Marx, class struggle is a core tenet and a practical means for effecting radical sociopolitical transformations for the majority working class. It is also a central concept within conflict theories of sociology and political philosophy.