Answer:
Marxism is a methodology, otherwise know as historical materialism, which includes some axiomatic verdicts ('the point of philosophy is not to interpret the world but to change it,' 'class struggle is the motive force of history,' etc) and a much more vivid critique of capitalist political economy than can be outlined in a single quora answer.
Leninism was thus the application of this method toward a different set of circumstances. Particularly, Lenin theorized via Marxism the development of capitalist-imperialism as a 'final stage' of capitalism. Moreover, Lenin was able to apply Marxism correctly enough to take part in the seizure of power and the liquidation of the capitalist class in Russia. Thus, Leninism (in the post-Lenin years) has been described (somewhat falsely due to its overall optimism) as Marxism in the era of imperialism and when the proletariat is increasingly gaining ground.
Step-by-step explanation:
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