Karl Marx's classic definitions of class and society under capitalism are still widely used today. Ideas such as class, revolution, production and oppression are employed across a broad range of academic subjects, reaching beyond politics, economics and sociology. Yet these concepts, within a specifically Marxist framework, are not always easy to understand. This book is an ideal student introduction that explains, in clear and concise chapters, the precise meaning and implications of each of Marx's key concepts. Furthermore, the contributors show how these ideas continue to be relevant, and how they relate to modern society. The contributors include leading academics in the field of politicial science. Outlining clearly what each concept means, they move on to situate it within cutting-edge contemporary political theory. Concepts include historical materialism, capitalism, class, the state, imperialism, the division of labour, oppression, production and reproduction, revolution, working class internationalism, equality and democracy.