Adha, a period of "communal enjoyment" for Muslims worldwide, has officially arrived. Here's what we've learned about the Islamic holiday.

The rest of the holiday is spent visiting family and friends, exchanging greetings and gifts, and sharing festive meals. The most common greeting is Eid Mubarak. The Arabic saying translates to “blessed Eid”. Here is how people say Eid Mubarak in different languages around the world.