President Trump has auto-enrolled about 70 million American children into Trump Accounts. Here is what that means.

Trump Accounts are savings accounts for youth. The programme launched in July with nearly 8 million accounts opened.

Auto-enrollment adds every child under 18. But enrollment alone does not unlock the money.

Parents must claim the account through the Trump Account mobile app. Only then can they manage it and let others contribute.

Children born during Trump's second term can get a one-time 1,000-dollar federal deposit. Claiming is required for that too.

Unclaimed accounts sit with the Bank of New York Mellon as trustee. The money is held, not lost.

Over 4.5 billion dollars have been deposited since July 4. The accounts are meant to build long-term savings.

Critics will watch uptake and costs. Supporters call it one of the president's signature policies.

The programme's cost and uptake will be debated in Congress. Its long-term impact is still unknown.