The message a text conveys about a topic is called the .

The message a text conveys about a topic is called the theme.

The theme is the central idea of a work. A common expression is: ''an underlying theme''. This means that it is a thought, an idea that the writer is portraying in his words. Understanding the plot, the characters, the details of what is happening and why is all the things that you need to see the theme in a work. Seeing who is the subject and what the subject wants will give us the whole picture of the theme in question.