Answer:
it provides a brief background about the essay’s subject.
Step-by-step explanation:
An introduction is a presentation on the theme of the essay, being able to literally introduce the subject that will be discussed, placing readers around the theme and the main idea defended in the text.
Based on this, we can say that the introduction shown in the question above is very effective, because it provides a brief background on the subject of the essay, as an introduction should do.