A carbonyl compound is an organic molecule that contains a carbon atom double-bonded to an oxygen atom, known as a carbonyl group (C=O). This functional group is found in various types of compounds, including aldehydes and ketones. Aldehydes have the carbonyl group at the end of the carbon chain, while ketones have it within the chain. Carbonyl compounds play a significant role in many chemical reactions and are important in various industries, including pharmaceuticals and food production. They are often involved in processes like oxidation and reduction, making them essential for understanding organic chemistry and biochemistry.