Muslims across the world are preparing for a month of fasting, spirituality and reflection this Ramadan.
Each year millions of Muslims will begin fasting from sunrise to sunset and engaging in activities that challenge their self-restraint and bring them closer to God.
The holiday is celebrated on different dates each year. Every year, the holiday starts approximately 11 days before it did the previous year. The exact date always depends on the sighting of the crescent moon. This year the moon was sighted on the night of Sunday, March 10, and fasting began on Monday, March 11.
Fasting can last for 29 or 30 days, depending on when the moon signifying the start of the next month is spotted.