Introduction
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In music, the introduction is a passage or section which opens a movement or a separate piece. In popular music this is often called an intro. The introduction may be the first statement of primary or other important material, may be related to but different from the primary or other important material, or may bear little relation to any other material.
See also: musical form.
In an essay or article, an introduction is a beginning section which states the purpose and goals of the following writing. This generally followed by the body and conclusion, and may be preceded by an abstract.
The introduction describes the scope of the document. It gives the brief explanation or you can say a summary of the document. The readers can have idea about the following text before they actually start reading it.
Keeping the concept of introduction same, different documents have different style to introduce the written text. For example, when you introduce a Functional Specification, the introduction consists of information what the whole document has to explain. If a Userguide is written, the introduction is about the product. If you go for a report, the introduction will tell you a summary about the report contents.
In the demoscene, an intro is a short demo with only few screens. They are often small, due to competition rules.
As a title or description of a work it indicates the work covers the basics needed to reference or understand the more detailed treatments of the topic covered elsewhere.