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Many of the fruits and vegetables which we eat are coated with a wax coating to help retain moisture and make them look more appealing. Some of the ingredients in those coatings are kosher-sensitive, and therefore, there are people (particularly in Israel) who are careful to only eat fruit with a certified kosher coating. If you see a kosher symbol next to the PLU code (on the sticker found on the fruit), this is a way of assuring those people that the coating only contains kosher ingredients. However, the cRc and most other hashgachos are of the opinion that the wax coatings are inedible (and happen to just be put on in a very thin layer such that the average consumer doesn't notice them) and may, therefore, be used even if some of the ingredients in the coating happen to be non-kosher.