This is the 349th most frequent Danish word.
bil
Car.
Here, 'bil' is used as a noun denoting an object, a car, which is described in a possessive context.
Jeg har en rød bil.
I have a red car.
Here, 'bil' is in the definite form 'bilen', expressing a specific car previously referred to or contextually understood.
Vi skal tage bilen til byen.
We will take the car to the city.
In this case, 'bil' is in the plural form 'biler', indicating multiple cars to generalize the objects worked upon.