Eid Mubarak! Eid-al-Fitr has began for millions of Muslims around the world.
Eid-al-Fitr means 'festival of the breaking of the fast'. It is one of the biggest celebrations in the Islamic calendar.
Eid al-Fitr marks the end of Ramadan, a holy month where Muslims refuse food and drink between dawn and sunset. This is known as fasting.
Fasting is important during Ramadan as Muslims believe it allows them to focus on their faith and become closer to Allah, or God.
The date Eid al-Fitr falls on is decided by the cycle of the Moon.