Quadratic Funding (QF) is a mathematically optimal way to fund public goods in a democratic community that amplifies the donations made by a large community over the contributions made by a small group with big pockets. QF emphasizes the number of donations rather than the size of the donation itself, and it helps prevent the "Tragedy of Commons." The mechanism functions by individuals crowdfunding donations toward public goods, and these individual contributions are matched by funds from a government, private philanthropist, or grants program.