A "Holy War" refers to a conflict primarily driven by religious motivations, where participants believe they are fighting on behalf of their faith. These wars often involve the desire to defend or spread a particular religion, such as Christianity, Islam, or Judaism. Historical examples include the Crusades, which were military campaigns initiated by Christians to reclaim the Holy Land from Muslim control. Holy wars can also be characterized by the belief that the conflict has divine approval or that participants will receive spiritual rewards for their actions. This concept can lead to intense fervor among followers, as seen in various religious movements throughout history.