Rakhi is an implicit assurance exchanged between a brother and sister strengthening their persistent relationship. This also supports their protective attachment against all evils and chances. Rituals like these, undoubtedly, ease out various communal strains, stimulate empathy, unfasten outlets of expression, and present an occasion to revise our responsibility as individual, most notably, fetch happiness in our humdrum lives.
This protective bond symbolized by Rakhi has resulted in immeasurable opinionated ties among monarchies and states. The leaves of Indian history give evidence that the Maratha and the Rajput queens have sent Rakhis even to Mughal kings who, despite their differences, have assuaged their Rakhi-sisters by rendering aid and fortification at vital instants and respected the everlasting bond. Even nuptial alliances have been established between kingdoms through the exchange of Rakhis.
For more information on Rakhi, Rakhi Origins, The History of Raksha bandhan, Raksha Bandhan celebrations in India Visit - http://en.wikipedia.org/wiki/Rakhi