While both the U.S. Department of Education (ED) and he U.S. Department of Housing and Urban Development (HUD) base their services and eligibility criteria on the McKinney-Vento Homeless Assistance Act (hereafter referred to as "The McKinney-Vento Act"), each agency uses a different definition of "homeless" due to differences in the federal statute. This brief is designed for staff of homeless assistance programs and members of Continuums of Care (CoCs) funded by HUD, as well as for State Coordinators for Homeless Education and local homeless education liaisons who operate under the guidance of ED. The brief provides basic information to help homeless service providers and homeless education staff understand each other's role in supporting children, youth, and families experiencing homelessness, while offering tools to enhance collaboration among agencies. A section on federal definitions of "Homeless" is included.