Prediction Markets are exchanges where you bet against other people on the outcome of events, like 'Who will be the next President of the United States?' or 'Who will win the Super Bowl?' If you are smarter than the crowd, you make money.
Predict the outcome of elections or Supreme Court nominations.
Predict the outcome elections, military engagements, referenendums.
Predict who will win the Super Bowl, World Series or NBA Finals.
Predict where stock markets will finish the day, week or month.
Predict the performance of global currencies, country GDP growth rates.
Predict who will win the Academy Awards, Emmies, Grammy's, who will have the #1 album or movie.