Ramadan begins this week, a holy, month-long observance for Muslim communities in the United States and around the world.  

Many Muslim people will observe Ramadan by fasting from sunup to sundown, praying together, holding communal meals and festivities and more.

Asma Sayeed, an associate professor of Islamic Studies at UCLA, explained that Ramadan is rooted in many practices, including to “invoke the remembrance of God for a continuous period” and “to celebrate and remember the revelation of the Qur’an as a gift to humanity.” 

But when is Ramadan? Why do Muslims engage in fasting for Ramadan? Here’s what you need to know. 

When is Ramadan? 

Ramadan, the ninth month of the Islamic calendar, begins on Wednesday, March 22 in the United States and continues through April 21, ending in the holiday Eid al-Fitr.  

What is Ramadan? 

Ramadan is a significant month for many Muslim people that involves prayer, fasting, spending time with family and friends and more.  

“The simplest answer is that it’s the ninth month in the Islamic lunar calendar,” Martyn Oliver, faculty chair of the American University Core, told USA TODAY. “The more specific sense is that it’s one of the holiest celebratory months in Islamic practice.”    

Muslims believe that, during the month of Ramadan, the Prophet Muhammad was given the Qur’an, Islam’s holy book. It marked the first time that God revealed to Muhammed he was a prophet tasked with carrying God’s message.