The delegated powers of the United States president are those that have been granted by Congress in order to facilitate the president's abilities to carry out his duties. Together with constitutional powers, they make up the expressed powers of the president, all of which are outlined by the U.S. Constitution.
Inherent powers, meanwhile, which are a third category of presidential power, are those that are interpreted by each individual president in their capacity as chief of the executive branch of government.
These might include emergency powers, during times of national disaster and war. Abraham Lincoln, for example, suspended several civil liberties during the Civil War. One of these was the writ of habeas corpus, which protects people from imprisonment without trial.