The Fourth Great Ninja War is a major conflict in the Naruto series, where the five great ninja villages unite against a common enemy, the Akatsuki and Obito Uchiha. This war is marked by intense battles, powerful jutsu, and the involvement of legendary ninjas, including Madara Uchiha and Kaguya Otsutsuki. The war begins when the Ten-Tails is resurrected, threatening the entire world. Allied forces face numerous challenges, including betrayal and the resurrection of fallen ninjas. Ultimately, the war leads to significant character development and the resolution of long-standing conflicts within the series.