Final answer:
Emilia, Iago's wife, reveals Iago's plot and his use of the handkerchief to frame Desdemona in Shakespeare's 'Othello.'
Step-by-step explanation:
At the end of Shakespeare's Othello, it is Emilia, Iago's wife, who reveals the truth about the handkerchief to Othello and the others. Emilia realizes that Iago used the handkerchief, which she had found and given to him, to frame Desdemona and tarnish her faithfulness to Othello. She boldly confronts Iago and exposes his deceitful actions, leading to a tragic conclusion where the truth of Iago's nefarious plot is unveiled.