Fortified wines are wines that have undergone a fortification process, that is, they have been enriched with additional alcohol. The fortification process can be achieved in a number of ways, but is usually done by adding grape distillate or spirits to the wine that has already been produced. This makes the drink stronger, with a high alcohol concentration that can reach anywhere from 17% to 22%. During the fortification process, the taste and aroma of the wine can also change and become more intense, making fortified wines very popular for tasting after lunch or dinner as a digestif. Fortified wines can be white or red and are produced in different regions of the world, but some of the most famous include port, sherry, and Madeira. Fortified wines are also used in cooking as an ingredient in various dishes and sauces.