The play begins on a street in Venice.
Iago and Roderigo are having a disagreement.
Roderigo is upset because Iago had not told him about Desdemona's recent marriage to Othello.
Roderigo loves Desdemona and had previously asked her father for her hand in marriage.
Desdemona has just married Othello.
Iago and Roderigo inform her father, Brabantio, of Desdemona's marriage.
Iago is upset at Othello for naming Cassio as his lieutenant.
Iago is out to cause trouble for Othello.
Brabantio threatens to arrest Othello for using witchcraft to win his daughter, but Desdemona confirms her love for Othello.
In Cyprus, Cassio fights and loses his position as lieutenant.
Iago sets Cassio up by encouraging him to seek Desdemona's help for Cassio's reinstatement of his position.
Meanwhile, Iago plants seeds of jealousy in Othello concerning Cassio and Desdemona.
When Desdemona pleads for Cassio's position, Iago uses this as a trap to insinuate that Cassio and Desdemona are having an affair.
Othello becomes enraged with jealousy.
Iago plants Desdemona's handkerchief on Cassio.
When Othello learns that Cassio has Desdemona's handkerchief, he is convinced that Cassio and Desdemona are having an affair.
Wild with rage, Othello smothers Desdemona.
When Emilia, Iago's wife, reveals that Iago deceitfully planted the handkerchief on Cassio, Othello regrets killing Desdemona.
Othello is in utter hopelessness; therefore, he kills himself.
Iago is arrested.