Youth suicidal behavior continues to be a significant national problem in need of urgent attention by school personnel. The purpose of this introductory article to the special series is to provide an overview of youth suicidal behavior, including research-based information on demographic data; risk factors and warning signs; and where, when, and how youth suicidal behavior typically occurs. Common myths and current controversies about youth suicide are also discussed, as are the implications of youth suicidal behavior for school-based practice. A brief discussion of current research gaps and needs is provided, as well as an introduction to the other articles in the special series on school-based suicide prevention. (Contains 1 table.)