The Aldol reaction is a commonly used organic chemistry reaction that involves the condensation of two carbonyl compounds, usually an aldehyde and a ketone, to form a β-hydroxy carbonyl compound. This reaction is also known as the aldol condensation and aldol addition. It is named after the one of the organic chemist, Alexander Borodin, who first discovered the process. The reaction has several variants like the crossed aldol reaction, Robinson annulation reaction, Mukaiyama aldol reaction, and Mannich reaction. All of which add on to the usefulness of Aldol reaction as an important tool in the synthetic organic chemistry.