Fuller's Earth is a natural clay material primarily composed of montmorillonite, a type of clay mineral. It is known for its ability to absorb oil and grease, making it useful in various applications, including cosmetics, cat litter, and industrial cleaning products. The name "Fuller's Earth" originates from its historical use by fullers, who cleaned woolen cloth by removing grease and dirt. This versatile substance is also used in environmental applications, such as soil remediation and water purification. Its absorbent properties help in trapping contaminants, making it valuable for cleaning up oil spills and other hazardous materials. Fuller's Earth is often found in deposits around the world, including regions in the United States and India.