A digestif is an alcoholic beverage that is taken just after a meal, purportedly as an aid to digestion — hence the name, which is borrowed from French. If a digestif is a bitters, it will contain bitter or carminative herbs that some believe will aid digestion.
In contrast to apéritifs (which are taken before a meal), digestifs usually contain more alcohol. Digestifs are usually taken straight (neat) and are most often spirits such as amari, bitters, brandy, grappa, tequila, or whisky. Some wines (usually fortified wines) are served as digestifs — for example, sherry, port and madeira.