Hydrogenation is a chemical process that involves the addition of hydrogen to unsaturated organic compounds, typically alkenes or alkynes, to convert them into saturated compounds. This process is commonly used in the food industry to convert liquid vegetable oils into solid or semi-solid fats, such as margarine. Hydrogenation can also be applied in various industrial processes, including the production of fuels and chemicals. The reaction typically requires a catalyst, often nickel, platinum, or palladium, to facilitate the addition of hydrogen.