Cyber bullying is defined as the act of bullying others through modern technologies like social media. It usually involves spreading rumors, making threats, or teasing others online where information is publicly shared and judged. Some common causes of cyber bullying include seeking revenge, entertainment, or boosting one's ego. The effects on victims can include depression, low self-esteem, poor academic performance, fear of technology, and lack of sleep. To prevent cyber bullying, people should raise awareness, think before posting personal information online, use privacy controls, and block harassing individuals.