This is the 536th most frequent French word.
message
A communication or information sent from one person or group to another.
Here, 'message' refers to a form of communication, such as a text or email the speaker just received.
Je viens de recevoir un message de lui.
I just received a message from him.
In this case, 'message' refers to the underlying meaning or moral conveyed by the book.
Le message de ce livre est très profond.
The message of this book is very profound.
Here, 'message' signifies a statement or piece of information the speaker wants to relay to someone.