Original: A sultana was originally a raisin made from a specific type of grape of Turkish origin, but the word is now applied to raisins made from common grapes and chemically treated to resemble the traditional sultana.
Simplified: A sultana was originally a raisin made from a specific type of grape of Turkish origin. The word is now used for raisins made from common North American grapes and chemically treated to resemble the traditional sultana.