What is the Oedipus Complex, Anyway?

The Duden defines the Oedipus complex (Oedipus conflict) as follows: “Psychoanalytical term for the early childhood, in both sexes developing relationship to the opposite-sex parent.” The term was coined by Sigmund Freud. But what exactly is the Oedipus complex and where did the term actually come from? Who was Oedipus, anyway? Oedipus is a figure … What is the Oedipus Complex, Anyway?