Final answer:
The introduction of an essay encompasses the thesis statement, background information, and main points, while the conclusion, which is not part of the introduction, provides a summary and reinstatement of the thesis.
Step-by-step explanation:
The introduction of an essay serves a pivotal role in framing the context and leading readers towards the main arguments or thesis statement. It ordinarily includes background information about the topic, develops interest, and sets the stage for the thesis statement. The main points that will be discussed in the body of the essay are also typically previewed. However, one element that is not characteristic of an introduction is the conclusion. The conclusion is where the writer wraps up the essay, summarizing the main points and reinstating the thesis, but in a way that suggests reflection on or an outcome of the initial points made.