Printing is a process of creating copies of documents, images, or other materials. Engraving is a method of carving a design into a hard surface, such as metal or stone. ETCHING is a similar process, but instead of carving, it involves using acid to create a design on a hard surface. Reproducing is the process of making multiple copies of an original document or image. LITHOGRAPH is a printing process that uses a flat surface and ink to create a design. PRESS is a machine used to print documents or images. INDENTATION is a technique used to create a raised or lowered area in a document or image. PHOTOGRAPH is a PICTURE taken with a camera. NEWSPAPER is a publication that contains news articles and other information. PICTURE is an image created with a camera or other device. LETTER is a written message sent from one person to another. STAMP is a small piece of paper or ink used to mark a document or image. EDITION is a version of a document or image. COPY is a duplicate of an original document or image. PUBLISH is the process of making a document or image available to the public. Deadtree is a slang term for a printed document or book.