What is the dramatic contribution of character of Iago in the play "Othello"

Throughout William Shakespeare's play "Othello" ,we learn a lot about the dramatic contribution of character of Iago , his insatiable desire for revenge, and constant deception of the entire cast. we are aware of this deceit through the dramatic irony employed throughout the play in the form of soliloquies and the ruse of the 'honest Iago'. He is a ruthless sociopath. Shakespeare employs the format of the tragedy to his play. No other character can even come close to his evil. He just has a burning hatred for the world, especially Othello. Shakespeare didn't just create Iago's character t…