Glucose syrup is a viscous, sweet liquid made primarily from corn starch. It's produced by breaking down the starch molecules into smaller chains of glucose molecules, resulting in a syrupy consistency. Glucose syrup is widely used in food production as a sweetener, thickener, and moisture-retaining agent. It's commonly found in candies, desserts, baked goods, beverages, and processed foods. Because it's a highly versatile ingredient, it's used in a variety of food products to enhance flavor, texture, and shelf life.