Final answer:
Communism is a political and economic ideology advocating for a classless society. Karl Marx contributed to communism through the co-authoring of the Communist Manifesto and his theory of society that emphasized class struggle.
Step-by-step explanation:
Communism is a political and economic ideology that aims to create a classless society where the means of production are owned and controlled by the community as a whole.
Karl Marx made significant contributions to the development of communism. He co-authored the Communist Manifesto in 1848, which outlined the principles and goals of communism. Marx's theory of society emphasized the importance of class struggle and predicted the eventual transition from capitalism to socialism and then to communism.