“Prediction Markets” allow you to trade on the outcomes of real-world events. You choose a market, then an event and open a “Yes” position if you think it will happen, and a “No” position if you think it won’t. You can choose how much money you want to trade for each position. You can find “Prediction Markets’ in the main menu and the top navigation bar.
More information, including any prohibitions about each specific event is available on the event’s details screen.