What is the plot of Othello?
In Othello, Shakespeare deals with the classic scenario of a black dude hooken-up with a white chick.. her dad is 'oh-my-goodness' angry when he finds out, because Othello has been doin' stuff behind his back. A real scum-bag called Iago decides that Othello needs to be pulled down a peg-or-two... you see he is real jealous cause Othello didn't give him the promotion he wanted... he sets up this plan with a missus (Desdomona) is messing around... (of course to kill Othello) It all ends in tears... Roderigo dead, Othello stabs himself, smouthers Desdomaona, Iago stabs Emilia, all three end up dead on the bed together. Iago is punished until death.
Iago wanted to make Othello jealous of Cassio. Had he simply said "Cassio is having an affair with your wife", Othello could have dismissed it as a lie or a mistake. But by saying "I'm sure there is nothing going on between Cassio and your wife" Iago gets Othello to suspect Desdemona and to build up his suspicions on his own.
There is no novel of Othello, actually. The famous Othello is a play by Shakespeare. Plays are not novels. If Othello was white, Othello wouldn't have been insecure, his relationship with Desdemona wouldn't be disapproved of and Iago might have hated Othello less. That is, of course assuming that Othello is white and so is everybody else. If Othello were white and everyone else was black, the story would be much the same because Othello's…
It isn't essential. It is merely one of the options that a writer can use for his plot. Consider 'The Hound of the Baskerville's' there is no internal conflicts in this story. (Maybe a little in the servants.) Consider Hamlet Macbeth and Othello. Internal conflicts galore - as that is the conflict that the play write choses to exploit.
Brabantio is Desdemona's father. He becomes very upset when Desdemona elopes with Othello and accuses Othello of committing witchcraft in order to woo his daughter. Othello denies any wrongdoing and Brabantio warns Othello that if Desdemona deceived her father, she can deceive Othello as well. Brabantio dies from a broken-heart resulting from Desdemona's marriage.