What is "freerice"

Freerice is an ad-supported, free-to-play website that allows players to donate to charities by playing multiple-choice quiz games. For every question the user answers correctly, 10 grains of rice are donated via the World Food Programme. The available subjects include English vocabulary (the original subject with which the game launched), multiplication tables, pre-algebra, chemical symbols (basic and intermediate), English grammar, SAT, foreign language vocabulary for English speakers (French, German, Italian, Latin, and Spanish), human anatomy, geography (flags of the world, world capitals, country identification, and world landmarks), the identification of famous artwork, literature, quotations, and world hunger. A user's total score is displayed as a mound of rice and the number of grains.