The art of engraving and printing from a metallic or soft plate is quite a long procedure and need a. good competence to imagine the final result. It is a little bit like creating a sculpture taking away the material (stone, wood, clay or whatever you are working with) bringing out the final result.
When you have finished carving you have a plate, which can be used a limited number of times. That’s why also this kind of printing is quite precious.