What is freeroll?
Freeroll is a free poker tournament where you can win real money. Poker sites offer these games in order to get you to join their website. For example one of the poker sites offers four freerolls each day.
If you play for real money you can earn points and join to freerolls which have higher prices. Usually, there are a lot of players in these tournaments and about 10% of them wins, but most of them get only a very little amount of money except the first ones. If you want to join freerolls you should be quick because the available free spaces fills up fast.