Each year, approximately 25,000 youth exit the foster care system before being reunified with their family of origin, being adopted, or achieving another permanent living arrangement. These youth often have limited resources with which to secure safe and stable housing, which leaves them at heightened risk of experiencing homelessness. This book documents a series of research activities designed to address knowledge gaps related to the housing options available to youth who have aged out of foster care. Furthermore, this book describes the extent to which -- and how -- communities are using Family Unification Program (FUP) to support youth; reviews the characteristics of the young people, their risk of homelessness, and the barriers they face in securing stable housing, along with relevant federal and, to a lesser extent, state policies; and describes a wide range of housing programs for young people aging out of foster care, present a program typology, and conclude with the identification of a small group of innovative housing programs that may warrant closer exploration.