Ramadan is the longest month of the Islamic calendar.
Ramadan . also romanized 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 commemorate the first revelation of the Quran to Muhammad according to Islamic belief . Ramadan ( Arabic : رمضان ) or Ramadhan is the ninth month of the Islamic calendar , and the month in which the Quran was revealed .