The predestination paradox, also called the causal loop or causality loop, is similar to the other two paradoxes, especially the ontological paradox. It involves one event causing another when the cause happened after the effect in some sense. It is something in the future going back in time and performing some action or making some change, but that change being necessary for the present or future of the time traveler. The time travelling was part of the past of the time traveler, so they did not actually change the outcome of their life.
One example of the predestination paradox is a man's horse being spooked and almost jumping off a cliff, but a mysterious stranger stopping the horse and saving the man's life. Then in the future, the man travels back in time and saves a man and his horse from going off a cliff. The man and the stranger were in fact the same person, and the actions the man took when he traveled back in time were necessary to his future. They were predestined.
One example of the predestination paradox is a man's horse being spooked and almost jumping off a cliff, but a mysterious stranger stopping the horse and saving the man's life. Then in the future, the man travels back in time and saves a man and his horse from going off a cliff. The man and the stranger were in fact the same person, and the actions the man took when he traveled back in time were necessary to his future. They were predestined.