Formaldehyde is a colorless gas with a strong, pungent odor. It is commonly used in the production of building materials, household products, and as a preservative in laboratories. In its liquid form, it is often found in disinfectants and embalming fluids. Exposure to formaldehyde can occur through inhalation, skin contact, or ingestion. While it is useful in many applications, it is also classified as a potential human carcinogen, meaning it may increase the risk of cancer with prolonged exposure. Proper ventilation and safety measures are important when working with this chemical.