This is the 1015th most frequent Swedish word.
dörren
"The door."
In this sentence, 'dörren' is the definite form ('the door') and directly refers to a specific door involved in the action.
Jag stängde dörren bakom mig.
I closed the door behind me.
Here, 'dörren' again takes the definite form and is the subject of the sentence describing its characteristics.
Dörren är blå och har ett stort handtag.
The door is blue and has a large handle.
In this case, 'dörren', still in its definite form, is the object of the request being addressed.