Why was Pamela so popular when it was published?

Pamela; or, Virtue Rewarded (1740) achieved immediate and immense popularity due to its innovative epistolary style, which allowed Samuel Richardson to provide a deep, intimate look into the consciousness of his characters. By focusing on a single, dramatic action—a servant girl’s struggle to preserve her virtue against the predatory advances of her wealthy master—the novel captivated readers with its exploration of class dynamics and the tension between sexual instinct and moral codes.12

The story’s premise, based on a narrative of a maid who successfully defends her virtue and is ultimately rewarded with marriage, resonated with contemporary audiences. While some critics later viewed the heroine as a calculating social climber, the novel’s emotional intensity and its pioneering use of the letter form helped establish the novel as a respectable literary genre. Its success was so significant that it prompted parodies, most notably Henry Fielding’s Shamela, which sought to satirize what Fielding perceived as the sentimental prudery of Richardson’s work.23