Linked from
The 28 pages that link to Zakat, each with the reason it gives.
ShariaBroader topic: Sharia specifies duties of charitable giving and their conditions.
IslamBroader topic: It turns religious duty into structured support for people in need.
CharityBroader topic: Zakat makes charitable redistribution a formal religious obligation.
IbadahBroader topic: This duty makes charitable giving a formal act of worship.