Predict.fun is a decentralized prediction market platform where users can bet on the outcome of future events in categories such as politics, cryptocurrency, and sports. It allows users to buy and sell shares tied to possible event outcomes. Each event typically has binary options (like "Yes" or "No"), but it can also support multi-outcome scenarios. The price of these shares fluctuates based on the probability of the event occurring, which is determined by market participants' trading activity.