Stickers are high-demand printed products made by means of operational printing or silk-screen printing. As a basis for this printing products are used: paper of different density (the most common option), cardboard, film, textiles. The most popular are self-adhesive products that are completely ready for use. They can consist of three (adhesive, substrate, printed base) or four layers. In the latter case, there is an additional film or polymer coating designed to protect the surface from moisture, abrasion, and fading. Applying a sticker can be a manual or automated process.