Silica gel is a granular, porous form of silicon dioxide, commonly used as a desiccant to control humidity and moisture. It is often found in small packets labeled "Do Not Eat," which are included in packaging for products like electronics, shoes, and food to keep them dry and prevent spoilage. The gel absorbs moisture from the air, helping to protect items from damage caused by excess humidity. Although it is non-toxic, it is not meant for consumption. Silica gel can be reused by drying it out in an oven, allowing it to absorb moisture again for future use.