Ramadan is coming to a close, and that means it's time to celebrate Eid.
Eid al-Fitr is the celebration of the end of the Ramadan fast. The Islamic calendar is based on the cycle of the moon, so fasting is observed during the month of Ramadan, and Eid al-Fitr is therefore celebrated on the first day of the new month, the month of Shawwal.
Eid is a time of joy and celebration. It's a time of communal prayer, enjoying friends and family, exchanging gifts, giving charitable gifts, wearing new clothes, and of course eating lots of delicious (halal, of course) food!
Oh, and "Eid Mubarak" (meaning "blessed Eid") is the usual greeting.