All are multiple choice questions you can create, but each serves a slightly different purpose.
Poll: an open question that has no correct answer, whereas a
Trivia: a question that necessitates a correct answer, which you have to create when you create the object. When a user answers a trivia question, they will immediately know whether or not they have answered correctly.
Prediction: a question that starts in an open state. This means that the user can select any answer. A prediction does not have a correct answer when it is in an "open" state, but once it is closed, users can no longer submit responses. The final state occurs when you select "completed" on the prediction. You will then select the correct option which the users can then see.