McKinney-Vento Homeless Education Improvements Act is a federal law that was reauthorized in 2015 by the Every Student Succeeds Act (ESSA). 

McKinney-Vento eligible children/youth lack a residence that is:

• Fixed - Stationary, permanent, and not subject to change
• Regular - Predictable, routine, or consistent 
• Adequate - Sufficient for physical and psychological needs typical in home environments

McKinney-Vento establishes the definition of homelessness for the purposes of:

• Identification of homeless students/unaccompanied youth
• Immediate access to public education
• School selection & enrollment