Zakat is an Islamic obligation and one of the five pillars upon which the structure of Islam is built. It is indeed the most important rukn of Islam after prayer.
Conditions of Zakat
1-Islam: Zakat is not accepted from unbelievers in Islam.
2-Freedom: No zakat is taken from slaves.
3-True and settled ownership of the threshold of zakat in excess of a person’s necessities, such as food, clothes and residence.
4- The turn of a full lunar year after the ownership of the threshold of zakat.