Muslim Holy Month Ramadan also called as Ramazan, Ramadhan, or Ramathan) is the ninth month of the Islamic calendar, and is observed by Muslims worldwide as a month of fasting (Sawm) to celebrate the first revelation of the Holy Quran to Muhammad(SAW) according to Islamic belief. This annual observance is regarded as one of the Five Pillars of Islam. The Ramadan lasts 29–30 days based on the visual sightings of the crescent moon.
Chapter 2, Verse 185, of the Quran states:
The month of Ramadan is that in which was revealed the Quran; a guidance for mankind, and clear proofs of the guidance, and the criterion (of right and wrong). And whosoever of you is present, let him fast the month, and whosoever of you is sick or on a journey, a number of other days. Allah desires for you ease; He desires not hardship for you; and that you should complete the period, and that you should magnify Allah for having guided you, and that perhaps you may be thankful.