The federal definition of homelessness used by all public schools in the United States includes children and youth who lack a fixed, regular, and adequate nighttime residence. This definition specifically includes children and youth living in shelters, transitional housing, cars, campgrounds, motels, and sharing the housing of others temporarily due to loss of housing, economic hardship, or similar reasons. This is the same definition of homelessness used by Head Start, special education, child nutrition, and other federal family and youth programs.