The causative form in Japanese grammar is used to express the idea that someone makes or lets someone else do something. This means that the subject of the sentence is causing the action to happen. There are two types of causative verbs in Japanese: causative verbs with the させる (saseru) ending and causative verbs with the せる (seru) ending. Understanding and using the causative form is important for communicating various situations where one person influences or allows another person’s actions.