From the How it Works page of the DonorsChoose website:
The DonorsChoose model of citizen philanthropy begins with a teacher who wants to provide his or her students with an activity that school funds would not cover. At this website, the teacher can describe a student project and list the materials needed to make it possible.In this, the season of giving, this site makes it easy to help out the future of our country.DonorsChoose.org is not a bulletin board where teachers can directly post their proposals, however. Before accepting a proposal, DonorsChoose staff and volunteers verify the teacher's identity; confirm the existence of requested materials; negotiate discounts and attach a cost to the proposal; and, finally, review the proposed student project. If anything is unclear, staff email follow-up questions to the teacher.
Next, civic-minded individuals can browse teachers' submissions. A donor can make a tax-deductible contribution that fully or partially funds a chosen proposal.