Internal wars, also known as civil wars, occur when groups within a country fight against each other for control, power, or differing ideologies. These conflicts can arise from political, ethnic, or social tensions and often lead to significant loss of life and disruption of society. The consequences of internal wars can be severe, including displacement of populations, economic decline, and long-lasting divisions within communities. Examples of internal wars include the American Civil War and the Syrian Civil War, which illustrate how such conflicts can reshape nations and impact global stability.