How is instant coffee made? I understand the basic process of making coffee (harvested beans >> roasted >> ground >> brewed), but I don't quite understand how instant coffee is made.

What, exactly, is done differently? At what point in the process does instant coffee diverge from "real" coffee?
How instant coffee is prepared in the factory:


Coffee beans are roasted
They are ground very finely (0.5 mm - 1.1 mm in diameter)
The ground coffee is mixed with water in percolation columns which reaches 155 - 180 degrees Celsius.  This is the extraction process.
This mixture is then concentrated and/or dried using vacuum evaporation, freeze drying, or spray drying methods.


The result from this is what you get in the store.