Iago is a character from William Shakespeare's play Othello. He is the main antagonist of the play and is known as an evil doer. He is a manipulative and scheming individual who plots to ruin the life of the protagonist, Othello. Iago is a master of deception and uses his skills to manipulate the other characters in the play. He is ultimately responsible for the tragedy that befalls Othello and his beloved Desdemona.