Well, they're both made from corn - but they're not the same and aren't interchangeable. Corn syrup (both light and dark) can be easily found in the baking section of nearly any grocery store. It's generally kept near sugar, maple syrups, and molasses. Some versions of light corn syrup have a bit of vanilla added (Karo brand , for one). Dark corn syrup is enhanced with things to make it taste more like molasses. High fructose corn syrup isn't something you'll find in the store for home use because it's made specifically for commercially processed and produced food items. You'll see HFCS on food labels.