Introduction should draw reader's attention, set your main ideas and presentation of your ideas, the main point of the essay. (custom-paper-writing.com)
If the thesis statement is the point the body of your essay is the detailed explanation of very reason that you can come up with for the central point of your essay. (readkaplan.com)
You can expand the main theme or key points of your essay in body paragraphs. (essayschief.com)