Aldehydes are a class of organic compounds characterized by the presence of a carbonyl group (C=O) bonded to at least one hydrogen atom. They are commonly found in various natural and synthetic substances, playing important roles in chemistry and biology. Aldehydes can be produced through the oxidation of alcohols and are often used in the production of plastics, perfumes, and flavorings. One of the simplest aldehydes is formaldehyde, which is widely used as a preservative and disinfectant. Aldehydes can also be involved in reactions that lead to the formation of other compounds, making them significant in organic synthesis. Their unique properties contribute to their diverse applications in industries such as pharmaceuticals and cosmetics.