This is a very significant day. Many people are recommended to fast and make supplication
On this day. The gates of heaven are open on this day. It is believed sins are forgiven on this day.

The pilgrims do not fast, only those who do not go to Hajj. The significance is prayer fasting and supplication. The Holy Quran should be recited on this day as the reward is multiplied. Overall, it is a day of repentance.

Supplication is very important in form of Dua, Tasbee, etc. This day the last sermon was given by prophet Muhammad pbuh.
By Maz Ali