The lesson focuses on understanding and defining bullying, highlighting that it involves unwanted aggressive behavior with a real or perceived power imbalance among school-aged children. It introduces the acronym “Boo” to help remember key aspects: “Being mean,” “On purpose,” and “Over and over again,” emphasizing that bullying is intentional, repetitive harm that is not playful. The lesson underscores the importance of recognizing different forms and settings of bullying, encouraging awareness and proactive measures to address it.