Hello,
The conventional PCB layers usually:
- Top: Top copper tracks , solder side
- Bottom: Bottom copper stracks, component side (used if double sided)
- Layer #x: x is a number, for multi-layer(>2 side) boards.
- Silk layer: Silkscreen printing on top and bottom layers to identify component names and values and shapes to facilitate assembly. This is usually the white text on the PCB.
- Mask: Is the mask used to develop one of the copper tracks layers, it contains the shape (or inverted shape depending on your photoresist type) of the tracks
- Paste: This is a mask for the solder paste, it covers everything in the board except the pads of the components where there is going to be soldering.
Regards,
gam