Corn syrup is a clear, thick, sweet syrup with little taste, derived from corn kernels. It is very useful in cooking, as its moisture-absorbing qualities help to keep cakes and other baked items very moist. There isn't really an exact substitute for corn syrup, which is widely used in the United States. There, it is available both in its clear form and with added coloring and flavoring to give it a flavor similar to molasses. In Australia, many of the larger supermarkets stock the clear version, but if you have difficulty finding it you could substitute golden syrup (although the flavor will be different) or glucose syrup.
** Asian Cooking