That payment is sort of a partner arrangement with the child tax benefit program. Under the child tax benefit program, parents get a tax credit through the tax system, so they get, effectively, a reduction in what they owe in taxes every year. For children who are under the care of an institution or in foster care, this program provides the same level of support for those children, in those circumstances, as the child tax benefit program does.
So in a sense it ensures that all children are appropriately covered.