It might also include pictures or drawings of the company's products. You cannot understand what the entire document is about simply by reading the introduction.
The introduction is normally written first because it covers the most basic information about the company and does not require research or financial projections to complete.
The introduction to the document is like the first 10 minutes of a movie in which you find out what the story is going to be about.
The remainder of the document provides the full story.
An executive summary is a condensed version of the entire report and can be read as a standalone document.
The main difference between these two sections is their purpose.
Don’t assume the reader has just as much knowledge as you do, and will instantly get the points you're making.
In the case of the executive summary and the introduction – and for that matter the full document or report – ask experienced business people to read them and provide feedback regarding any concepts that aren’t completely clear.
The reader can find further explanations and answers to questions he may have in the full document.
A lack of clarity diminishes the effectiveness of both the executive summary and the introduction.