"Book" is mainly written on bamboo slips, silk and paper with a pen. As a method of writing characters in ancient times, "printing" involves printing, which is an important technology for the reproduction and dissemination of characters.
In ancient times, people often carved on hard materials such as stones, bones, bamboo slips and wood chips, which was also an important way of writing records. With the development of paper and pen and ink, writing has gradually become the main way of writing characters in ancient times, forming a unique calligraphy style.