Raksha Bandhan is a Hindu festival celebrated all over India with different customs of different region. Also known as "Rakhi Poornima" in North and North Western parts of India this festival is celebrated on a full moon day as ''poornima'' means full moon. In central parts of India such as Madhya Pradesh, Chattisgarh, Jharkand and Bihar this day is celebrated as "Kajari Purnima". It is also called "Janivaara" in Kannada,"Janeyu" in Hindi,"Poonool" in Tamil," Poita" in Bengali and "Jhanjyam" in Telugu. Sisters tie the rakhi on the wrist of their brother which is considered as an auspicious thread. The elder brother in return offers a gift to his sister and vows to look after her same while an elder sister returns offers to her younger brother. Feeding each other with sweets is the common tradition of this festival. Rakhi can be tied on anyman's wrist considering him brother by any woman,there is no strict convention that both of them has to be tied in any kind of blood relation.
The history of rakhsha bandhan holds its origin to the past decades of medieval era during the Mughal Rajput conflict.
Rani Karnavati of Chittor sent a rakhi to the Mughal Emperor Humayun when she was threatened by Bahadur Shah of Gujarat. Humayun abandoned an ongoing military campaign to ride to her rescue. The oldest reference of rakhi goes back to 300 B.C. when Alexander invaded India. Alexander's wife heard of the rakhi festival and tied a rakhi on King Puru's wrist to save him as Alexander was jolted by Puru's fury.
In the Hindu mythology,the great epic Mahabharata,during the Rajasuya Yajna after Shishupal's death, Krishna was left with a bleeding finger and Draupadi tied a strip of silk off her sari on Krishna's hand. Krishna promised to help her at whatever time she needed and he did so when Draupadi was about to be shamed by being disrobed in front of the whole court by her evil brother-in-law Duryodhana. Krishna divinely elongated her sari so that could not be removed and thus saved Draupadi.