Freeroll poker tournaments stay true to the name - it is a free tournament (no entry fee) where the prize pool is made up of "donations" made by the house, or in this case, the online poker operator. Freeroll prize pools are often made up of different fees accumulated throughout the year. A majority of online poker sites require players earn a certain number of points to play. Points are earned via real money games. PokerStars is widely known for their freerolls. You can read more about Freeroll poker by clicking here.