The period of adolescence involves growth, adaptation, and dramatic reorganization in almost every aspect of social and psychological development. The Encyclopedia of Adolescence offers an exhaustive and comprehensive review of current theory and research findings pertaining to this critical decade of life. Leading scientists offer accessible and easily readable reviews of biological, social, educational, occupational, and cultural factors that shape adolescent development. Issues in normative development, individual differences, and psychopathology/maladjustment are reviewed. This chapter focuses on adolescents use of media and technology.