This is the 195th most frequent Persian word.
مربوط
Related.
Here, 'مربوط' indicates a relation or connection between the book and the subject of history.
این کتاب به تاریخ مربوط است.
This book is related to history.
Here, 'مربوط' denotes a thematic link between the documentary and the artist's life.
مستند مربوط به زندگی این هنرمند بسیار جالب است.
The documentary related to the life of this artist is very interesting.
In this sentence, 'مربوط' is used to describe the connection of the question to a previous session.