Raksha Bandhan (the bond of protection in Hindi and Panjabi) is a Hindu festival, which celebrates the relationship between brothers and sisters. It is celebrated on the full moon of the month of Shraavana.
The festival is marked by the tying of a rakhi, or holy thread by the sister on the wrist of her brother. 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. The brother and sister traditionally feed each other sweets. It is not necessary that the rakhi can be given only to a brother by birth; any male can be "adopted" as a brother by tying a rakhi on the person, that is "blood brothers and sisters", whether they are cousins or a good friend. Indian history is replete with women asking for protection, through rakhi, from men who were neither their brothers, nor Hindus themselves. In 16th century, 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 rakhi may also be tied on other special occasions to show solidarity and kinship (not necessarily only among brothers and sisters), as was done during the Indian independence movement.
Most rightly said , it is one of the foremost Indian Festival in India which every sister want to celebrate .