The Association of German Chambers of Industry and Commerce (in German: Deutscher Industrie- und Handelskammertag or DIHK for short) is like a big organization that helps lots of businesses in Germany. These businesses all work together to make things that people need and use every day, like cars or phones.
The DIHK helps these businesses by giving them advice on how to work better or how to sell their products to other countries. They also make sure that these businesses are following the laws and rules that the government has made.
Think of the DIHK as a big group of grown-ups who help other grown-ups who make things and sell them to people all over the world.