A civil war was a type of war.
On Earth, a number of civil wars were fought, including the English Civil War in the 17th century, (PROSE: The Roundheads) the American Civil War in the 19th century (TV: The War Games) and the Spanish Civil War in the 20th century. (PROSE: History 101)
The Daleks fought at lease two civil wars: the Dalek Civil War between the Daleks loyal to the Emperor Dalek and humanised Daleks "infected" with the human factor (TV: The Evil of the Daleks) and the Imperial-Renegade Dalek Civil War between the Renegade Daleks loyal to the Supreme Dalek and the Imperial Daleks loyal to Davros. (TV: Revelation of the Daleks, Remembrance of the Daleks)
Other civil wars included the Martian Civil War on New Mars, (AUDIO: The Prisoner of Peladon) the civil war which resulted in the fall of the Skonnon Empire, (TV: The Horns of Nimon) the Trion Civil War, (TV: Planet of Fire) the Rostax Civil War, (COMIC: Pay the Piper) the Gallifreyan Civil War (AUDIO: Fractures, Warfare) and the City of the Saved Civil War. (PROSE: Of the City of the Saved, A Hundred Words from a Civil War, Tales of the Civil War)