Zakāh is one of the five pillars of Islam, a religious obligation for Muslims to give a percentage of their wealth to those that are eligible. It is considered a spiritual and social duty, purifying one's wealth and heart, and providing support to those in need within the community. Zakāh is calculated based on one's financial assets and earnings, with specific guidelines on what qualifies and how much should be contributed. By fulfilling this pillar, Muslims demonstrate their commitment to social welfare and the equitable distribution of resources.