Why did Gottfried Wilhelm Leibniz argue that the actual world is the best of all possible worlds?

Gottfried Wilhelm Leibniz argued that the actual world is the best of all possible worlds as a solution to the problem of evil. He posited that because God is omnipotent, omniscient, and omnibenevolent, He possessed the capacity to conceive of all possible worlds and the wisdom to select the most perfect one for creation.1

Leibniz maintained that if God had not chosen the best possible world, He would have lacked a sufficient reason to create any world at all. Regarding the presence of suffering and sin, Leibniz argued that the interconnectedness of all events means that removing specific evils might necessitate the inclusion of even greater ones. Furthermore, he suggested that our perception of evil may be limited by a human perspective, whereas the world remains optimal according to a divine standard of goodness. This optimistic doctrine, known as Leibnizian optimism, was famously challenged by Voltaire in his satirical novel Candide.213