A passage is a short extract from a book or other printed material.
A paragraph is a distinct section of a piece of writing, usually dealing with a single theme and indicated by a new line, indentation, or numbering.
The introduction paragraph is an introductory paragraph, as the opening of a conventional essay, composition, or report, designed to grab people’s attention. It informs readers about the topic and why they should care about it, but also adds enough intrigue to get them to continue to read. In short, the opening paragraph is your chance to make a great first impression.
The body paragraph is a group of related sentences about a particular topic or idea directly relating to the thesis. Because essays are composed of multiple body paragraphs, writing and organizing good paragraphs is one of the most important aspects of creating a well-organized and developed essay.
The conclusion paragraph is, in some ways, like your introduction. You restate your thesis and summarize your main points of evidence for the reader.
The topic is the broad, general theme or message. It is what some call the subject.
The Main idea is the “key concept” being expressed.
Details, major and minor, support the main idea by telling how, what, when, where, why, how much, or how many.
A thesis statement is a sentence that states the topic and purpose of your paper.
Topic sentences are a part of every paragraph. They identify the main idea of the paragraph. A topic sentence also states the point the writer wishes to make about that subject. Generally, the topic sentence appears at the beginning of the paragraph. It is often the paragraph’s very first sentence. A paragraph’s topic sentence must be general enough to express the paragraph’s overall subject. But it should be specific enough that the reader can understand the paragraph’s main subject and point.