Candide is characterized by its tone as well as by its erratic, fantastical, and fast-moving plot. A picaresque novel with a story similar to that of a more serious coming-of-age narrative, it parodies many adventure and romance clichés, the struggles of which are caricatured in a tone that is bitter and matter-of-fact. Still, the events discussed are often based on historical happenings, such as the Seven Years' War and the 1755 Lisbon earthquake. As philosophers of Voltaire's day contended with the problem of evil, so does Candide in this short theological novel, albeit more directly and humorously. Voltaire ridicules religion, theologians, governments, armies, philosophies, and philosophers. Through Candide, he assaults Leibniz and his optimism.

Candide has enjoyed both great success and great scandal. Immediately after its secretive publication, the book was widely banned to the public because it contained religious blasphemy, political sedition, and intellectual hostility hidden under a thin veil of naïveté. However, with its sharp wit and insightful portrayal of the human condition, the novel has since inspired many later authors and artists to mimic and adapt it. Today, Candide is considered as Voltaire's magnum opus and is often listed as part of the Western canon. It is among the most frequently taught works of French literature. The British poet and literary critic Martin Seymour-Smith listed Candide as one of the 100 most influential books ever written.