What is 3D Printing?

Yesterday was about wearables. Today is about 3D printing. Why? 

Simple. It doesn't take a prognosticator to see that 3D printing wearables are coming. 

Stratasys, one of the largest manufacturers of 3D printers and 3D production systems, has an introductory infographic explaining the state of 3D printing.

Just like how a digital printer is ubiquitous in our society, 3D printers will soon find its way into every home and/or office.