Ramadan (Arabic: رَمَضَان, romanized: Ramaḍān [ra.ma.dˤaːn]), also spelled Ramazan, Ramzan, Ramadhan or Ramathan, is the ninth month of the Islamic calendar, observed by Muslims worldwide as a month of fasting (sawm), prayer, reflection and community. A commemoration of Muhammad’s first revelation, the annual observance of Ramadan is regarded as one of the Five Pillars of Islam and lasts twenty-nine to thirty days, from one sighting of the crescent moon to the next Source: Wikipedia