That way you know what kind of audience your writing for you can use different words with a lot more complexity. its completely different writing for kindergarteners and writing a paper for a college seminar.
Hope this answered your question.
I would say to convey thoughts and feelings because when I wrote them in class my english teacher would tell us to write down what we think about the passage.
Again, Angel, Along, American, Athletics, Added and Address. Ojalá que esto te ayude.