In general, the introduction will introduce the topic to the reader by stating what the topic is and giving some general background information.
This will help the reader to understand what you are writing about, and show why the topic is important.
You may also provide definitions for any ambiguous terms or concepts.
Your reader needs to know what you mean when you say certain things.
It is true that the first impression—whether it’s a first meeting with a person or the first sentence of a paper—sets the stage for a lasting impression.
The introductory paragraph of any paper, long or short, should start with a sentence that peaks the interest of readers.
Because it starts broad, and gradually narrows towards a focused, but not overly specific thesis.
The thesis is specific enough to fully explore the essay, but it's not so specific that there is nothing more to write about.
In a typical essay, that first sentence leads into two or three other statements that provide details about the writer's subject or process.
All of these sentences build up to the essay's thesis statement.