To clarify what I meant, Marxism and its descendants (Marxism-Leninism, Stalinism, Maoism, Juche, etc.) are the most “popular” forms of communism. By which I mean: they’re what was implemented in most (all?) countries that had communists seize power - the USSR, China, Cambodia, Vietnam, North Korea, Cuba, and so on. In university we read Marx, not Bakunin; in Canada we have a Marxism-Leninism party, not an anarcho-communist party. Etc.

If you’re asking the latter question in good faith, I’d encourage you to consult Wikipedia; it has good articles on both the term “proletariat” and Marx’s phrase “dictatorship of the proletariat”.