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Carrier Oils are oils whereby you would add an Essential Oil for massage purposes. Essential Oils are not designed to be applied directly to the skin, except perhaps for Lavender Oil, and so adding them to a carrier oil means that they can be applied to the skin in a diluted form.
The Carrier Oils tend not have an overwhelming aroma and neither do they evaporate.
Different oils will have different properties so it's worth doing a bit of research to find out exactly what you want.