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Refurbished parts are spare parts that have been extracted from a used device and were repaired to be functional again. Note: "Refurbished" is not a protected term, anyone can use it and it can mean a variety of things. "Remanufactured" however is a protected term which means that the product meets all specifications of the original new product. With refurbished parts it can be difficult to tell what you get. Some parts might be refurbished in an unreliable way (e.g. reflowing a chip on the motherboard), others might have required only small repairs like a software reconfiguration and might work very well. When buying refurbished parts, it is good to look for a long warranty period and to buy from a reputable and accountable manufacturer.