Line engraving
Line engraving is a term for engraved images printed on paper to be used as prints or illustrations. The term is now much less used and when is, it is mainly in connection with 18th or 19th century commercial illustrations for magazines and books, or reproductions of paintings.
Steel engraving is an overlapping term, for images that in fact are often mainly in etching, mostly used for banknotes, illustrations for books, magazines and decorative prints, often reproductive, from about 1820 to the early 20th century, when the technique became less used. Copperplate engraving is another somewhat outdated term for engravings. With photography long established, engravings made today are nearly all artistic ones in printmaking, but the technique is not as common as it used to be; more than other printmaking techniques, engraving requires great skill and much practise, even for an experienced artist.
Technique
Engraving for the purpose of printmaking creates plates for intaglio printing. Intaglio engravings are made by carving into a plate of a hard substance such as copper, zinc, steel, or plastic. Afterward ink is rubbed into the carved areas and away from the flat surface. Moistened paper is placed over the plate and both are run through the rollers of an intaglio press. The pressure exerted by the press on the paper pushes it into the engraved lines and prints the image made by those lines. In an intaglio print, the engraved lines print black.