As published here on 3DPI's site:

Are you ready? Let’s get started !

Welcome to 3DPI's Beginner’s Guide to 3D Printing. Whether you are new to 3D printing technology or just looking to close a few knowledge gaps, we’re glad you stopped by. By now, most of us have heard, at some level, about the potential of 3D printing. But with this guide we are offering insights into the history and the reality of 3D printing — the processes, materials and applications — as well as measured thoughts on where it might be heading. We hope you’ll find this to be one of the most comprehensive 3D printing resources available, and that no matter what your skill level is, there will be plenty in here to meet your needs.

An Interesting Read

The article cover the basics of 3D printing categorized in 8 distinct sections. The sections are the following:

  • The Basics
  • The history
  • Technology
  • Processes
  • Materials
  • Global Effects
  • Benefits and Value
  • Applications

There is also the final section - more an appendix - called Glossary that covers the terms and the lingo of 3D printing.