This is the 12th most frequent German word.
an
"An" in German means "at," "on," "to," or "by," depending on the context.
Here, 'an' is used as a preposition to indicate the object of the thought.
Ich denke an dich.
I am thinking of you.
In this sentence, 'an' functions as a preposition to specify the location of the picture.
Hänge das Bild an die Wand.
Hang the picture on the wall.
Here, 'an' is used as a preposition to denote proximity or location relative to an object.