Waqf refers to the gift of money, property or other items to charity. The original gift is used to bring a return, but cannot be sold. For example, if a field is given as a Waqf, the crops and benefits derived from it can be used by the charity, while the field is held intact as the original investment. 

Waqf is a form of continuous charity (sadaqah jariyah), and the rewards for this type of charity continue even after the donor's death - for as long as people continue to benefit from the Waqf.

The Prophet Muhammad (peace be upon him) used to establish Waqf himself, and he regarded Waqf as one of the best forms of charity.

Today, Islamic Relief organises Waqf to cater for long-term projects.

Donations are pooled and invested according to the principles of Islamic Shari'ah, and the income is then used to help the poor. The Waqf is comparable to Western concepts of charitable trusts or endowments.