You cannot deduct a contribution to a donor advised-fund if the sponsoring organization is a war veterans' organization, a fraternal society, or a nonprofit cemetery company. There are also other circumstances in which you cannot deduct your contribution to a donor-advised fund.
Generally, a donor-advised fund is a fund or account in which a donor can, because of being a donor, advise the fund how to distribute or invest amounts held in the fund. For details, see Internal Revenue Code section 170(f)(18).
Additional information is available at the IRS Donor-Advised Funds website.
Note that any link in the information above is updated each year automatically and will take you to the most recent version of the document at the time it is accessed.