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
But these are REALLY important, not some literature for the mob.
Well, because the mob was quite illiterate at the time.Then also such fiction was printed, meaning for the reading of the book.
Well, since the last 50 years (even hundreds of them), it's all about printing - books, leaflets, business cards, even shirts, mugs, pens ...Well, really everything.
This is a very convenient solution, because you can immediately overcome mistakes made by potential customers when placing an order. Often, they send a bad file in the wrong format, with the web printing this error is still captured by the script itself accepting the order.