This is the 3075th most frequent Turkish word.
belgesel
Documentary.
Here, 'belgesel' is used as a noun referring to a 'documentary', a type of television or film program.
Bu akşam ilginç bir belgesel izleyeceğim.
This evening, I will watch an interesting documentary.
Used in plural or general form, 'belgesel' indicates the genre of programs that provide factual information.
Belgesel izleyerek yeni bilgiler öğrenebilirsin.
By watching documentaries, you can learn new information.
Here, associated within a possessive or descriptive phrase, 'belgesel' specifies a particular kind of documentary.