This is perhaps one of Shakespeare's more interesting plays, if you will. In comparison to Macbeth it isn't quite the walk in the park.
I think conceptually it enables the reader to see that characters can influence characters to such a degree that the original traits are masked and changed. Tragedy in this play is definitely a main component - and a great emphasis that perhaps the villain doesn't always find their true defeat. In a way, wasn't the "villain" successful? He lied to everyone and pretty much killed whomever got in his way.
Othello is referred to as a "Barbary horse" () and a "lascivious Moor" (). In he denounces Desdemona's supposed sin as being "black as mine own face." Desdemona's physical whiteness is otherwise presented in opposition to Othello's dark skin: "that whiter skin of hers than snow." Iago tells Brabantio that "an old black ram / is tupping your white ewe" (). In Elizabethan discourse, the word "black" could suggest various concepts that extended beyond the physical colour of skin, including a wide range of negative connotations.