Ramadan is the Arabic name for the ninth month in the Islamic calendar. It is considered one of the holiest Islamic months.
It's also one of the Five Pillars of Islam. These are five principles that Muslims believe are compulsory acts ordered by God. Muslims believe it was during this month 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).
The Muslim holy month starts on Tuesday, April 13, and even amid a global pandemic, most of the world's 1.6 billion Muslims will observe it in some form.
This means there's a good chance you might encounter someone — a friend, a coworker, a neighbor, your child's teacher — who will be celebrating, fasting, and doing all sorts of other activities that are unique to the holy month.