Structured wiring is a method of providing the communications infrastructure of your business in a well organized, easy to understand, and thorough way to provide a general solution to your present and future needs.
Rather than run a coax here, and a Cat 5 there, and another coax somewhere else as you guess at the future needs, the structured approach is to consistently run a full bundle of wire to every significant office.
If you are going to put in two times the amount of wire that you will use at any one time, then it is important that you organize it so you can find and connect what you need at any point in the life of the business.
Structured wiring will do this for you as it provides uniformity and completeness.