Acetaldehyde is a colorless, flammable liquid with a strong, fruity odor. It is an organic compound with the chemical formula C2H4O and is commonly used in the production of various chemicals, including acetic acid and plastics. Acetaldehyde is also found naturally in some fruits and is produced during the fermentation process. In addition to its industrial uses, acetaldehyde is a byproduct of alcohol metabolism in the human body. It can be toxic in high concentrations and is classified as a potential human carcinogen. Proper handling and safety measures are essential when working with this compound.