Ramadan is the most sacred month of the year for Muslims — the Prophet Mohammed reportedly said, "When the month of Ramadan starts, the gates of heaven are opened and the gates of hell are closed and the devils are chained."

Muslims believe it was during this month that God revealed the first verses of the Quran, Islam's sacred text, to Mohammed, on a night known as "The Night of Power" (or Laylat al-Qadr in Arabic).

During the entire month of Ramadan, Muslims fast every day from dawn to sunset. It is meant to be a time of spiritual discipline — of deep contemplation of one's relationship with God, extra prayer, increased charity and generosity, and intense study of the Quran.

But if that makes it sound super serious and boring, it's really not. It's a time of celebration and joy, to be spent with loved ones. At the end of Ramadan there’s a big three-day celebration called Eid al-Fitr, or the Festival of the Breaking of the Fast.

This content is adapted from Jennifer Williams's, "Ramadan: 9 questions about the Muslim holy month you were too embarrassed to ask."