How is zakah different from ordinary charity that muslims might give

Zakat is the compulsory giving of a set proportion of one's wealth to charity. ... Zakat is the third Pillar of Islam. Zakat does not refer to charitable gifts given out of kindness or generosity, but to the systematic giving of 2.5% of one's wealth each year to benefit the poor.

- a.) african slaves and indentured servant’s

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definitely a for sure. ill see and update if i get the answer