Iago is a jealous man who seeks revenge against Othello and Cassio. He claims they have seduced his wife Emilia, though his true motives are never revealed. Through manipulation and deception, Iago turns Othello against Desdemona using jealousy. Iago's evil plan relies on his ability to appear honest while secretly victimizing others to further his deception of Othello. His success comes through a series of betrayals of other characters to exploit their hidden passions and weaknesses.