The Nutri-Score is a 5-level label that reflects the nutrient profile of a food or dish in a very compact form. The scale ranges from A to E.
The rating allows you to compare different products or dishes in terms of their nutritional value. This makes your purchase decision easier without knowing the exact ingredient list or preparation.
The Nutri-Score is not a legal requirement. It is a voluntary labeling. You can find more information here and on the website of the German Federal Ministry of Food and Agriculture.