Joseph Conrad's seminal novella, Heart of Darkness, stands as a profound and multifaceted exploration of European colonialism in late 19th-century Africa. This paper argues that the novel offers a powerful, yet complex and often ambivalent, critique of the colonial enterprise, exposing its brutal practices, its corrupting influence on colonizers, and the inherent hypocrisy of its "civilizing mission," while simultaneously reflecting some of the era's pervasive biases. Through the journey of Marlow into the Belgian Congo and his encounter with the enigmatic Kurtz, Conrad vividly depicts colonialism as a system driven by insatiable greed, leading to the physical and psychological devastation of both the colonized and the colonizers. The narrative challenges conventional notions of "civilization" and "savagery," revealing the moral decay at the core of imperial ambition. While the novel's portrayal of African people has drawn significant postcolonial criticism, its enduring relevance lies in its unflinching examination of power, morality, and the enduring legacies of imperialism.