Question

how are printing machine useful in knowledge spreading?

Answer 1

The printing press spread within several decades to over two hundred cities in a dozen European countries.[5] By 1500, printing presses in operation throughout Western Europe had already produced more than twenty million volumes.[5] In the 16th century, with presses spreading further afield, their output rose tenfold to an estimated 150 to 200 million copies.[5] The operation of a press became synonymous with the enterprise of printing, and lent its name to a new medium of expression and communication, "the press".[6]