Milad-un-Nabi is also known as Barawafat or Mawlid marks the birth of the Prophet.
According to Islamic calendar the birthday of the Islamic prophet Muhammad occurs in the third month, Rabi' al-awwal. The celebration of Milad-un-Nabi origin is said to be have been since 11th century in the Fatimid dynasty.
The birth anniversary of the Holy Prophet is remembered on 12th Rabi-ul-Awwal of the Islamic lunar calendar year by all Muslims.
The Holy Quran was revealed by the Holy Prophet Muhammad. The same day marks the death anniversary of the Holy Prophet.
In India and some other parts of the sub-continent Milad-un-Nabi is popularly known as as 'Barawafat'. The word 'barah' stands for the twelve days of the Prophet's sickness.