Electronic media play an integral role in the lives of all people. Over the years, the rapid evolution of technology in various forms has significantly influenced the way people live and interact. Televisions, record players, computers, and VCRs changed how people learned, were entertained, stayed connected, and explored. In the past two decades, these devices have been joined or replaced by cell phones, i-Pods, MP3 players, DVDs, and PDAs (personal digital assistants). These new technologies have become a mainstay for how people, particularly children and adolescents, communicate and are entertained. Technology affords young people many benefits: the ability to talk to people worldwide, to more easily and regularly communicate with family and peers, and to make rewarding social connections that may be difficult to make in person. Some young people report that they feel better about themselves on-line than they do in the real world and feel it is easier to be accepted on-line. In addition, the growing accessibility of the internet through cell phones and wireless computer access allows adolescents to quickly and easily increase their knowledge about a broad number of topics. Technological advances also create the potential for risk. This brief focuses on one of the potential risks of technology use: "electronic aggression". Electronic aggression is any kind of aggression perpetrated through technology--any type of harassment or bullying that occurs through e-mail, a chat room, instant messaging, a website (including blogs), text messaging, or videos or pictures posted on websites or sent through cell phones. ["Electronic Media and Youth Violence: A CDC Issue Brief for Researchers" is a publication of the Centers for Disease Control and Prevention's National Center for Chronic Disease Prevention and Health Promotion, the National Center for Injury Prevention and Control, and the Adolescent Goals Team.]