Evidently Iago is employing a disguise as if he were a wolf in sheep's clothing. The purpose of such a disguise is exposed when Iago reveals “The Moor is of a free and open nature / That think men honest that but seem to be so” (I.3.390-391). Seemingly, Iago will use his friendship along with Othello's trusting and open personality to his advantage by manipulating Othello. Ultimately, Iago’s deceptive disguise is the functional weapon that allows him to eradicate Othello.
Iago methodically exploits deceitful tactics to accomplish his goals, primarily to destroy Othello. Iago is described as a “brilliant opportunist taking advantage of the chances presented to him, as a personification of evil” (Gale). Iago's ability to manipulate people and situations is spectacular and imperative to perform his dark deeds. Iago plans to accomplish this goal by stirring up jealousy within the heart of Othello by indoctrinating him to believe his wife Emilia is having an affair with Cassio. In order for Iago's plan to succeed, he first devises and successfully executes a plan where Cassio is demoted from the rank of Lieutenant. As a result, Iago convinces Cassio to