Ramadan is the ninth month of the Islamic lunar calendar. Muslims from all over the world observe fast during sunlight hours in this holy month. A person who observes fast refrain himself from eating, drinking, building sexual relationships, and sinful acts. The month starts with the sighting of the crescent moon and consists of 29 or 30 days. According to Islamic beliefs, the devils are chained at the start of this month, the doors of heaven are opened, and doors of hell are closed. According to Islam, fasting is not just to be hungry all day but to learn self-control, patience, sacrifice, taqwa with spiritual and mental purification.