1. Printing involves reproducing text and images using ink on paper through various processes like offset lithography, flexography, rotogravure, inkjet, and laser printing. 2. Flexography is widely used for printing on non-porous substrates like food packaging. It uses a flexible relief plate to transfer ink from an anilox roll onto the print material. 3. Rotogravure is mainly used for magazines and packaging. It involves engraving an image onto a copper cylinder for rotary printing on reels of paper.