The Bildungsgutschein is a voucher from the Agentur für Arbeit. It lets unemployed people take language classes and professional training for free. It’s a type of unemployment benefit.
It’s similar to the AVGS voucher, but it’s more for long-term training. It can cover months of training, and even a complete career change.
Information about the AVGS voucher (in German) – Agentur für Arbeit