(CNN) Here is some background information about Ramadan, the Islamic holy month of fasting.

In 2021, Ramadan is expected to begin at sundown on April 12 and end on May 11. (Dates may vary slightly by country depending on the first sighting of the crescent moon.)

Facts

Ramadan is the ninth month of the Muslim year.

Ramadan begins with the sighting of the new moon, but the exact date often depends on clerics in a particular nation.

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