Eid Mubarak ( Bengali: ঈদ মুবারক, Arabic: عيد مبارك, Persian/Urdu: عید مُبارک, Hindi: ईद मुबारक, Malayalam: ഈദ് മുബാറക്)is a traditional Muslim greeting reserved for use on the festivals of Eid ul-Adha and Eid ul-Fitr. Eid refers to the occasion itself, and Mubarak means "Blessed."
Muslims wish each other Eid Mubarak after performing the Eid prayer. The celebration continues until the end of the day for Eid ul-Fitr (or al-Fitr) and continues a further three days for Eid ul-Adha (or Al-Adha). However, in the social sense people usually celebrate Eid ul-Fitr at the same time as Eid ul-Adha, visiting family and exchanging greetings such as "Eid Mubarak". This exchange of greetings is a cultural tradition and not part of any religious obligation.
Read more about Eid Mubarak: Regional Variations