Bullying is unwanted aggressive behavior among school-aged children that involves a real or perceived power imbalance and is repeated over time. True bullying is a repeated pattern of mean behavior intended to make the target's life miserable. Bullies tend to be impulsive, lack empathy, and view violence positively. They may bully due to their own experiences being bullied, jealousy, frustration, or a lack of parental warmth. Teachers should be knowledgeable about bullying, involve students and parents, and set clear behavioral expectations. Parents should watch for signs their child is being bullied and teach them how to handle it, while making their home a bully-free environment. Students should report bullying and avoid being alone.