The particle "も" in Japanese is used to indicate "also" or "too." It connects ideas or items, showing that something is in addition to what has already been mentioned. For example, in the sentence "私も行きます" (I will go too), "も" emphasizes that the speaker is included in the action. "も" can also be used to express similarity or to reinforce a statement. For instance, "彼も学生です" (He is also a student) highlights that 彼 shares the same status as others. This particle is versatile and essential for making comparisons or adding information in conversations.