If a child has been removed from the parents, they are often put into some kind of state care.
Foster parents take the children into their homes and care for them while the parents work to get them back.
Group Homes are private homes usually run by NGO's that warehouse kids in larger group settings than traditional foster care. They often employ staff that plays the role of the parent for their typical work day.
Sometimes foster kids are warehoused in institutions such as Psychiatric or Juvenile Detention Facilities.