Silicon dioxide, commonly known as SiO2, is a natural compound made up of silicon and oxygen. It is most commonly found in nature as quartz, a hard mineral that forms in various geological environments. SiO2 is a major component of sand and is used in many industries, including construction and glass-making, due to its durability and abundance. In addition to its industrial uses, SiO2 plays a crucial role in the environment. It helps in soil formation and provides essential minerals for plants. Moreover, it is found in many everyday products, such as ceramics and silica gel, which is used to absorb moisture.