What Is A Letter of Introduction?
As mentioned, a portfolio is like a one large résumé - usually, they will include your actual résumé, three accomplishments that you've done for other businesses or companies, three letters of recommendations, the letter of introduction, and some of your interests and activities. Because portfolios aren't necessarily for design work, some individuals may also include their school transcripts or college courses that are relevant to the work or company they are providing the portfolio for.
With technology a standard for most of us, you may find that putting up an online portfolio can be beneficial if you plan on working through online means or businesses. Even though many of us are using computers and the Internet in most cases, it's still a good idea to have a hard bound copy of your portfolio, placed within a three ring binder with protective sheets to protect your work.
Now that you know a little more about a portfolio, let's get down to the real question - what is a letter of introduction? Just as a portfolio is very much like a résumé, a letter of introduction is that résumé's cover letter.
Within a letter of introduction, you specify why you're interested in this particular business (or school) that you've chosen, what aspirations and goals you have for you career in general, what skills and abilities you possess that will not only help you in this career, but how it will help this particular company, and why you stand above the others who are also looking to be a part of this business or school.