There are a ton of websites that host their own fantasy football competitions, so you may be wondering which one is the official one. The NFL has its own fantasy football league that includes a couple of different ways to play. You can play against random people on the internet or create your own league where you play against your friends or family.
With that said, there are other leagues hosted by CBS, Yahoo, ESPN, Fox, and other major networks where you can also play. These aren't NFL official, but they are still a lot of fun. Check them all out before deciding which one is right for you.