Technology suffuses the lives of teens. Almost all American adolescents use the internet, and those who go online tend to do so multiple times throughout the day. Moreover, technology is increasingly found in the classroom, and teachers and schools often expect students to have access and prior exposure to technology in addition to the training they receive in school.  In order to understand what it means to be a teenager today, one must understand the technological context of teens’ lives, and this chapter charts some baseline dimensions of teens’ technology ownership and use.