In order to press a vinyl record, you need to create a physical etching on electroplated stampers that will press each of your records.

There are two methods of creating these stampers- Lacquers and DMM.
A to Z works with both mastering technologies.
Below is a brief summary on the primary differences between the two equally viable solutions.

Lacquers are created by coating a silver metal disc with plastic AKA lacquer ( similar to nail polish.)  The audio from your master is physically etched into the lacquer master disc by a vinyl cutting lathe. A lathe operates like a glorified reverse record player (only way more expensive and precise) to transcribe the audio information onto the lacquer.
While the needle of a record player reads the grooves of a finished record, a lathe physically etches the audio in the soft lacquer creating a master disc that looks very similar to the grooves on a finished record.
This is the stage when the program level (or loudness,) side lengths and speed come into play. Once the Lacquer is created, Stampers are then manufactured from this lacquer master.
Stampers are electroplated metallic plates that are attached to a vinyl press to mold the grooves of a finished record. A to Z will coordinate both lacquer and stamper production or you can arrange for this step on your own.