Karl Marx (1818–1883) was a revolutionary philosopher, economist, historian, and one of the most influential figures in the development of social theory and socialist thought. Born in Trier, Prussia, Marx studied law and philosophy at the universities of Bonn and Berlin. After his engagement with the Young Hegelians, a radical group drawing from the philosophy of Hegel, Marx's interest shifted to the critique of political economy and social institutions. His collaboration with Friedrich Engels led to the development of Marxist theory, which has had a profound impact on social and political thought across the world. Marx's seminal works, such as the 'Communist Manifesto' (1848) and 'Das Kapital' (Volumes I-III, published respectively in 1867, 1885, and 1894), delivered a critical analysis of capitalism and its socio-economic relations. His dialectical materialism aimed to expose the historical progression of economic systems, emphasizing the struggle between classes as the motor of historical change. The 'KARL MARX Ultimate Collection' assembles Marx's significant works, offering an extensive overview of his ideas and legacy. Marx's writing is characterized by its incisive critique of societal structures and its advocacy for proletarian revolution. His theory of surplus value, alienation in labor, and the idea of class struggle have influenced a wide range of disciplines including sociology, economics, political science, and philosophy. His impact extends beyond academia, having inspired numerous social movements and political regimes — leaving a controversial yet indelible mark on global history.