Cyberbullying or cyberharassment is a form of bullying or harassment using electronic means.Cyberbullying and cyberharassment are also known as online bullying.

It has become increasingly common, especially among teenagers. Cyberbullying is when someone, typically teens, bully or harass others on the internet, particularly on social media sites. Harmful bullying behavior can include posting rumors, threats, sexual remarks, a victims' personal information, or pejorative labels (i.e. hate speech). Bullying or harassment can be identified by repeated behavior and an intent to harm. Victims may experience lower self-esteem, increased suicidal ideation, and a variety of negative emotional responses, including being scared, frustrated, angry, and depressed. Awareness in the United States has risen in the 2010s, due in part to high-profile cases. Several US states and other countries have laws specific to cyberbullying. Some are designed to specifically target teen cyberbullying, while others use laws extending from the scope of physical harassment. In cases of adult cyberharassment, these reports are usually filed beginning with local police. Not all negative interaction online or on social media can be attributed to cyberbullying. Research suggests that there are also interactions online that result in peer pressure, which can have a negative, positive, or neutral impact on those involved.