This is the 8145th most frequent German word.
ingolstädter
A person or thing from Ingolstadt, a city in Germany.
In this sentence, 'Ingolstädter' refers to the residents of Ingolstadt, representing a demonym.
Die Ingolstädter genießen die schöne Altstadt.
The citizens of Ingolstadt enjoy the beautiful old town.
Here 'Ingolstädter' functions as an adjective describing the origin of the beer produced in Ingolstadt.
Ich habe ein Ingolstädter Bier probiert.
I tried a beer from Ingolstadt.
In this context, 'Ingolstädter' defines the location of the automotive plant, attributing it to Ingolstadt.