It is a 3 dimensional printing process that creates a real object from a 3D digital file. There are several ways to achieve this object, they all rely on the deposition and solidification of material layer by layer.
Some 3D printers can print in color. In this case, the information must be informed in the 3D file. The cheapest printers only print in one color for now.
It depends on your 3D printer, the most common material is plastic (ABS or PLA), but it is possible to print metal, silver or wood.
Again it depends on your 3D printer. More precisely it depends on the size of its printing plate.
This is a process that sends directly the models to a 3D printer without having to download them beforehand. It is a solution offering the possibility to secure and control 3D file sharing.