This is the 91st most frequent Danish word.
denne
The Danish word "denne" means "this" (used for singular common-gender nouns).
In this sentence, 'denne' is used as a demonstrative pronoun to specifically refer to 'bog' (book), indicating a particular book that is being talked about.
Denne bog er meget interessant.
This book is very interesting.
In this context, 'denne' is used similarly as a demonstrative pronoun referring to 'film' (movie), highlighting the specific movie being discussed.
Denne film vandt mange priser.
This movie won many awards.
Here, 'denne' is again a demonstrative pronoun used to specify 'restaurant' (restaurant), pointing out a particular one that the speaker likes.