A printing process which became commercially viable in the early 19th century developing, with refinements, into the dominant way of producing high quality images. The earliest lithography used limestone printing blocks (hence the name); these were later replaced with metal plates. The technique creates images which are much less mannered than those printed from engraved plates.
There’s a lot of technical detail to it which we can’t go into here, but we would like to dispel the confusion that sometimes arises from ‘lithograph’ being used as a fancy synonym for reproduction. It shouldn’t be. Any lithographed images we sell were originally produced by lithography, and are not reproductions.