Eid al Adha is the second Eid in the Islamic calendar and known as the Festival of Sacrifice - it is considered the holiest of the two festivals.
Ramadan began on the evening of Thursday 23 April and will end a month later on the evening of Saturday 23 May.
It is narrated from the Prophet of Islam (S) that the name is given to the fasting month because fasting burns the sins. (Bihar al-Anwar, vol.58. p.341).