What did Marx believe the proletariat would ultimately do and what was his reasoning behind this prediction?

Marx believed that the proletariat, or working class, would ultimately overthrow the capitalist system and establish a classless society. He believed this would happen because the proletariat, being the majority and facing exploitation and oppression under capitalism, would become conscious of their collective power and unite to bring about social change. Marx argued that the inherent contradictions of capitalism would lead to its downfall, paving the way for a more equitable and just society.