Prints taken on paper from incised plates.
The two main classes of engravings are intaglio and relief.
In intaglio engraving, the line engraved has a positive value. The line that is engraved on the plate is the line that appears on the print. Heavy pressure is applied to the plate to extract the ink to the paper.
In relief engraving, the lines engraved are negatives to leave the design in relief. Relief printing, or surface printing, transfers ink from the lines left on the surface of a plate (like printing from type).