Poker freerolls are online poker tournaments where entry is free. There is no entry fee but you can win a lot of prize money for real. This money is generally donated by the hosting site with the purpose of promotion and to generate more traffic to the site.
Such tournaments are beneficial to those who are beginners and seasoned players who wish to improve their game through poker freerolls. They also earn a lot of prize money without any risk.
There are numerous sites which provide online poker tournaments. Almost every poker room provides poker freerolls as well. Some have more number of freerolls with less prize pool, whereas others have less freerolls with higher prize money. You should choose the one that suits your requirement.
If you are a beginner, you should play at rooms offering more number of freerolls which will help you understand the game and gain experience. On the other hand, advanced players could go for more-prized games to add money to their account.