FanDuel is an online fantasy sports platform that allows users to create their own fantasy teams and compete against other players for cash prizes. With FanDuel, you can create your own fantasy team from a selection of professional athletes and compete against other players in daily and weekly fantasy sports contests.
From Wikipedia
FanDuel Group is an American gambling company that offers sportsbook, daily fantasy sports, horse racing, and online casino services. The company is headquartered in Manhattan, New York City and operates sportsbooks in a number of states including New Jersey, Pennsylvania, Indiana and West Virginia, as well as an online horse race betting platform, and a daily fantasy sports service.