On the 29th day of the Islamic month of fasting, Ramadan, the last iftar [break of fast after sundown] is known as Eid al-Fitr ; Eid for short. It is probably one of the most important holidays celebrated by Muslims around the world. Due to the Islamic calendar being 11 days shorter than the Gregorian calendar, Ramadan rotates along with the holidays celebrated within it. This year, Eid fell on September 20th. Some countries celebrated Eid today but others are waiting for tomorrow. In Malaysia, the morning begins with prayer as on other days during the month. After this is finished, family graves are visited and surahs and prayers are said for the deceased. All in all, it is a very joyous celebration for family members to enjoy each other's company and great food.
One downside to it being a major family holiday is the resulting mass movement of people. In neighboring Indonesia over 500 people were killed last year due to the number of Indonesians crowding the roads.
Here are a few websites displaying first, Eid around the world and second just in Malaysia. [It seems the King and Queen received some amazing cakes at the Palace for the festivities...]