Eid al-Adha

Eid al-Adha is a religious festival celebrated by Muslims worldwide as a commemoration of Ibrahim's (Abraham's) willingness to sacrifice his son Ismael for Allah. It is one of two Eid festivals that Muslims celebrate. Like Eid ul-Fitr, Eid ul-Adha also begins with a short prayer followed by a sermon (khu?ba).
Eid al-Adha is 3 days long and starts on the 10th day of the month of Dhul Hijja (?? ?????) of the lunar Islamic calendar. This is the day after the pilgrims in Hajj, the annual pilgrimage to Mecca in Saudi Arabia by Muslims worldwide, descend from Mount Arafat. It happens to be approximately 70 days after the end of the month of Ramadan.
In India and Pakistan it is also called Bakra Eid, where the goat is the animal most likely to be sacrificed. In Bangladesh it is called either Id-ul-Azha or Korbani Id. In South Africa it is also called Bakri Eid (or simply Bakrid in India).
While Eid ul-Adha is always on the same day of the Islamic calendar, the date on the Gregorian calendar varies from year to year since the Islamic calendar is a lunar calendar and the Gregorian calendar is a solar calendar. The Lunar calendar is approximately 10 days shorter than the Solar calendar.Each year, Eid ul-Adha (like other Islamic holidays) falls on one of two different Gregorian dates in different parts of the world, due to the fact that the boundary of crescent visibility is different from the International date line.

Qurbani:
This is the sacrifice as ordained upon Muslims to be given at the time of Eid al-Adha. Every Muslim adult; male and female – as long as possessing Nisab – are required (Wajib) to offer this sacrifice. The rewards are the same and the benefits include feeding the poor. Costs vary between countries, with the cheapest being around £30 for one part.
The slaughter of a small (domestic) grazing animal e.g. sheep, ram, goat, etc suffices per person, and a large (domestic) grazing animal e.g. cow, buffalo, camel, etc suffices for seven people. For many Muslims around the world the only time they can eat meat is during the time of Qurbani.
In addition to it being an ordained act and a Sunnah of Ibrahim (Alayhis-Salaam) and of all Muslims, The Messenger of Allah (Peace be upon him) has said that for every hair of his/her sacrificed animal a person will get a reward.