Hegel and Marx used the term "praxis" to refer to the practical application of theory or the process of putting theory into action. For Marx, praxis was a key concept in his theory of historical materialism, which posited that social change is driven by the struggles of different classes over the means of production. In this view, praxis was seen as the means by which the working class could achieve its goals of economic and political liberation.

Hegel used the term "praxis" to refer to the practical application of theory as well. According to his philosophy, praxis was a way of reconciling the contradictions between ideas and reality, and it played a crucial role in the process of historical development. For Hegel, praxis was a means of achieving freedom and self-realization for individuals and society as a whole.