Rainbow is a non-profit, service-oriented organization that teaches girls three basic virtues: Faith in a Supreme Being and other people, having Hope in all that they do, and Charity toward others.

The International Order of the Rainbow for Girls was founded in 1922, by William Mark Sexson, a Christian minister and active member of the Masonic Lodge. Rev. Sexson had spent his life dedicated to both fraternal organizations, and his ministry, and became aware of the need for a youth organization for young women who were from a Masonic or Eastern Star home.