What is the role of fate in Oedipus Rex?

In the play "Oedipus Rex," Sophocles centers the whole plot on the idea of a certain fate.
Fate is defined as an inevitable and often adverse outcome, condition, or end. In Oedipus Rex, there is one main fate. The whole plot of the play is actually built around the fate of King Oedipus.
When Oedipus was still developing in his mother's womb, Jocasta and Laius went to a soothsayer and had an oracle delivered to them. The oracle stated that Laius would be killed by his son, and that his son would sleep with his mother and have children with her later on in life. In order to prevent this fr…