Who are the Proletariat and the Bourgeoisie? -What would happen, according to Karl Marx?

-In Fundamentalist Socialism, Marx and Engels made the Ideas there were 2 Classes in Society. The Proletariat (Workers) and the Bourgeoisie (Owners of Production) -Exploitation of the Proletariat would lead to the Development of a Sense of Class Consciousness, causing the Proletariat to form a Mass Movement based on Trade Unions, overthrowing Capitalism and establishing a Temporary Workers' State