Aldehydes are a class of organic compounds characterized by the presence of a carbonyl group (C=O) bonded to a hydrogen atom. This structure gives aldehydes their unique properties, making them important in various chemical reactions. They are commonly found in nature and are used in the production of fragrances, flavorings, and plastics. One of the simplest aldehydes is formaldehyde, which is widely used as a preservative and disinfectant. Aldehydes can also be found in many essential oils and are involved in the synthesis of other organic compounds. Their reactivity makes them valuable in organic chemistry and industrial applications.