The term 'One of the Five Pillars of Islam' refers to five fundamental practices that are essential to the Islamic faith. These include Hadj (also spelled Hajj), which is a pilgrimage to Mecca, and Sawm, which is fasting during the month of Ramadan. Hadj is an obligation for all Muslims who are physically and financially able to do so, while Sawm is an obligation for all adult Muslims. Both of these practices are important for Muslims to demonstrate their commitment to their faith.