What is silica?

Silica, also known as silicon dioxide (SiO2), is a chemical compound that is an oxide of silicon. It exists in various forms, including quartz, sand, and amorphous silica. Silica is widely used in the production of glass, ceramics, concrete, and as a food additive. Fumed silica is used as a thickening agent and filler in various products, including cosmetics, paints, and adhesives. Silica gel is used as a desiccant to absorb moisture.