Acetal is a type of organic compound formed by the reaction of an aldehyde with an alcohol. It typically contains two -O- (ether) groups attached to the same carbon atom, which is also bonded to a hydrogen atom and a carbon chain. Acetals are commonly used in organic chemistry as protecting groups for aldehydes and ketones during chemical reactions. In addition to their role in organic synthesis, acetals are also found in various applications, including the production of plastics and resins. They are known for their stability and resistance to moisture, making them useful in the manufacture of products like polyoxymethylene and other engineering materials.