This literature review discusses Karl Marx's theory of ideology and how the ruling class shapes ideology to reinforce its power. It also examines the works of Judith Williamson and Louis Althusser, who built upon Marx's ideas. Specifically, it analyzes how Williamson viewed advertisements as shaping ideology and how Althusser argued ideology is reproduced through economic and social structures. The review concludes that Marx's theory of ideology remains relevant for understanding how society and media operate today through social divisions of class.