Wikipedia about laser printing
Laser printing is an electrostatic digital printing process. It produces high-quality text and graphics (and moderate-quality photographs) by repeatedly passing a laser beam back and forth over a negatively charged cylinder called a "drum" to define a differentially charged image.1 The drum then selectively collects electrically charged powdered ink (toner), and transfers the image to paper, which is then heated in order to permanently fuse the text, imagery, or both. As with digital photocopiers, laser printers employ a xerographic printing process. However, laser printing differs from analog photocopiers in that the image is produced by the direct scanning of the medium across the printer's photoreceptor. This enables laser printing to copy images more quickly than most photocopiers.
Źródło: https://en.wikipedia.org/wiki/Laser_printing
Polygraphy
The printing itself is a department wide as the sea and various fishes in this sea are swimming. From simple leaflets to large banners or window stickers. With such a broad concept, it is sometimes difficult to say what the printing company specializes in.
Some factories are choosing low-volume small-format prints, others for stickers, and others only for large-format printing. What sometimes makes it difficult to choose one plant for our orders, but what the market is like, and the price of services and their quality are also important.
Printing industry
What would a company be without business cards, leaflets or other printed articles? Well - the role of the printing industry on the market is still very large, and recently more and more. After all, it's hard for an enterprise that does not have its own leaflets or posters. These companies often outdo each other in offers and offer lower and lower prices, mainly for small businesses. This does not mean that it is a failing industry, there is still a lot of potential in the printing companies and those that provide them with materials. Now, the printing services are so accessible that even one-man companies can easily afford to regularly buy printed materials.