Final answer:
Involving Desdemona in his plot to help Cassio, Iago's aim is to sow the seeds of jealousy in Othello, leading to the tragedy's climax.
Step-by-step explanation:
The question revolves around Iago's manipulations in Shakespeare's play Othello. By involving Desdemona in his plot to help Cassio, Iago aims to make Othello jealous. Desdemona, known for her good nature, is likely to plead Cassio's case to Othello, which Iago can then twist to insinuate infidelity. This deception creates the tragic misunderstanding that precipitates the downfall of Othello. The involvement of Desdemona is crucial to Iago's agenda of causing chaos and destruction, leveraging her innocent intentions to further his own malicious goals.