Explanation

Eid al-Azha is celebrated annually on the 10th of Dhul-Hijjah

Eid al-Azha in Arabic means the 'festival of the sacrifice'

It marks the completion of Hajj

Commemorates Prophet Ibrahim's (Abraham's) willingness to sacrifice his son in obedience to Allah's command.

Additional information 

Doing ghusl on Eid is mustahabb. 

Eid Prayer is Wajib

Eid Salat consists of two 'Rakats' and six 'Takbirs'.

There are two Eid prayers in a year, 

1. Eid-ul-Fitr 
2. Eid-ul-adha.