Bhaiya Dooj is observed on the second day after Diwali celebrations. 

This day marks the beautiful relationship between a brother and sister. 

Sisters apply tilak on the foreheads of their brothers and pray for their prosperity and long life. 

It is believed that after killing Narakasura, Lord Krishna visited his sister Subhadra who welcomed him by applying a tilak on his forehead. 

And since then, this day is celebrated as Bhaiya Dooj.

Click here to get samples of IELTS essay writing task